About a month worth of gmails get deleted every so often. How can I stop it?

I use eM Client for Mac (version 7.2.35700.0) to read 6+ various gmail and other IMAP accounts. Once in a while, about every 4-5 weeks, I notice that a 2 months worth of emails disappears. Literally, I I seem to find most of them in the Trash folder, but maybe not all of them. Look at the attached screenshot showing the dates of emails in my inbox for one of the gmail accounts. There is a gap between 8/2/10 and 10/19/19. Another gmail account is missing emails from 8/22/19 to 10/18/19. There is no way I would have deleted so many emails. I don’t have any rules setup or archiving neither in eM Client nor in gmail accounts. At least not that I know of. 

Any ideas what is happening?