Mixpanel API Anomalies: Understanding Export Data Differences

Hey dear team! We are using the Mixpanel API 2.0/export to export our data, and we noticed some bazaar behavior of the API. We are querying All Events between 11/11/2024 to 11/16/2024 several times. We found out that:

with the exact same filter, the query on 11/15 returns more events than the query on 11/16
with the exact same filter, the query on 12/09 returns some extra events that never appeared in the previous queries.

Are these behavior expected? Do we have a explanation for this? Thank you!