Mixpanel and Singular SDK Integration: Issues with Event Tracking

Hi every one. We added Mixpanel SDK as well as Singular SDK in our app. Also we integrated Singular with Mixpanel. Singular is saying that they send install events with the name __START__ (Reference) The problem is for a specific day we have ~800 install events on Singular but we only receive 10 __START__ events in our Mixpanel dashboard. Has anybody faced this issue yet?