Sentry accepts events but not showing them

Hi there,
We are using sentry (installed with snap) for more than a year, and a month ago after a disaster that caused disk capacity problem, and performing a data retention, events are all getting accepted (we can see there is 21 events per second in stats page, but no events are showing up.

Could anybody help me with this?
We are using Sentry 9.1.2 and I tried submitting events from my command line.