so this is concerning 2 events that only contains device ID and not user ID because there are pages the user interacts with without logging in so what happens when these events when queried sometimes it shows the data and sometimes it does not. It is very concerning and what is the explanation to this
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When you track events in Mixpanel that only contain a $device_id (and not a $user_id), these events are considered "anonymous" and are attributed to the anonymous user associated with that device. This is standard behavior for pre-login or unauthenticated user activity.Why might these events sometimes not show up in queries?Summary:
The most common reason for this behavior is the propagation delay after ID merge, but it can also be due to how you are querying the data or issues in your event tracking implementation. If you continue to see unexplained inconsistencies, review your implementation for edge cases and ensure you are using the correct identifiers in your queries.If the issue persists and you cannot identify the cause, consider reaching out to Mixpanel support with specific examples for further investigation.
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Thank you for clarifying. Based on the knowledge sources, here are the main edge cases and explanations for why a Mixpanel Board (or report) with events containing only $device_id (anonymous events) might sometimes show data and sometimes not when you refresh: 1. Query Result Caching
Mixpanel uses server-side caching for report queries. The cache duration depends on the date range of your query (from 1 hour up to 14 days). When you refresh a Board or report, you may see cached results unless you explicitly use the "Refresh Data" option. This can lead to situations where the data appears unchanged or out-of-date, especially if new events have been ingested since the last cache refresh. To ensure you see the most current data, use the "Refresh Data" option from the three dots menu on the report, Board, or Board card Query Result Caching.2. ID Merge Propagation Delay
If you are using ID Merge (e.g., a user logs in and their $device_id is merged with a $user_id), it can take up to 24 hours for the mapping to propagate to all parts of the system. During this time, some reports or Boards may not reflect the merged data immediately, leading to inconsistencies when you refresh Identifying Users (Simplified) FAQ.3. Differences in Query Filters or Breakdown
If your Board or report uses filters or breakdowns (e.g., by user property vs. event property), and those properties are not present on all events (especially anonymous ones), the data shown can vary. Removing all filters and breakdowns can help isolate if this is the cause Data Discrepancies.4. Data Ingestion Delays
There can be a short delay between when events are sent to Mixpanel and when they appear in reports, especially for imported or server-side events. However, this is usually a matter of minutes, not hours or days.5. Edge Cases in Event Tracking Logic
If your event tracking code has conditions or bugs that sometimes prevent events from being sent (e.g., only tracking under certain circumstances), this can lead to apparent randomness in what data appears Product analytics implementation hiccups.Summary:
The most likely causes, based on Mixpanel documentation, are query result caching and ID merge propagation delay. Both can cause a Board to show different data on refresh, or to not update as expected. Always use the "Refresh Data" option to bypass the cache, and be aware of the 24-hour window for ID merge propagation. If the issue persists beyond these scenarios, review your event tracking logic and report filters for inconsistencies.If none of these edge cases explain your situation, the knowledge sources do not provide further details, and you may need to contact Mixpanel support for deeper investigation.
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Thank you for clarifying that the issue is not inconsistent data, but that sometimes the Board or report shows no data at all for events that previously appeared. Based on the knowledge sources, here are the most relevant edge cases and explanations for this behavior: ---
1. Hidden or Inactive Events/Properties in Lexicon
- Events or properties can be hidden in Lexicon by a Project Owner or Admin. Hidden events will not appear in reports or dropdowns, even though they are still ingested and count toward your data allowance. If an event is hidden, it will not show up in your Board until it is unhidden. - Inactive events (not fired in the last 30 days) are also hidden from dropdowns and reports, unless they have been modified in Lexicon. If your event hasn’t been sent recently, it may disappear from the UI, even though it still exists in raw data. Firing the event again will resurface it in the UI. Check for Hidden Events and Properties Hiding Data in Lexicon---
2. Query Filters or Report Configuration
- If your report or Board is filtered by a property that is not present on the anonymous events (e.g., filtering by $user_id when only $device_id is present), the query will return no data.
- Removing all filters and breakdowns can help determine if this is the cause.
Data Discrepancies---
3. Data Ingestion or Processing Delays
- While rare, there can be short delays in data ingestion or processing. However, this would typically result in a temporary absence of data, not a persistent one.---
4. Event Tracking Logic or Implementation Issues
- If the event tracking logic has changed, or if there is a bug that prevents the event from being sent under certain conditions, the event may stop appearing. This can sometimes be mistaken for a Mixpanel issue when it is actually a change in the code or deployment. Product analytics implementation hiccups---
5. Data Governance Actions
- If an event or property was dropped (not just hidden), it will no longer be ingested or appear in any reports. Dropping is a more permanent action than hiding. Hiding vs. Dropping Data---
What to Do Next
- Check Lexicon to see if the event or property is hidden or inactive. - Remove all filters from your report to see if the data reappears. - Verify your event tracking implementation to ensure the event is still being sent as expected. - Check with your team if any data governance actions (hiding/dropping) were recently taken.If none of these apply and the issue persists, the knowledge sources do not provide further explanation, and you should contact Mixpanel support for further investigation.---In summary: The most common reasons for events suddenly showing no data are hidden/inactive events in Lexicon, filters that exclude anonymous events, or changes in event tracking logic. These should be your first areas to investigate based on Mixpanel’s documentation.
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