Random email not showing up in inbox

I have noticed that some emails are occasionally not showing up in my Inbox. It shows up under “All Mail” and is tagged “Inbox” but can’t actually see it in the Inbox.
I think this may be related to version 8 but not sure. My calendar is also messed up and not giving me notifications multiple times and not at the right time. BUT the email issue is priority right now.
Any help is appreciated, thanks in advance.

Can’t get any help and emClient isn’t getting any better. Guess I’ll be moving on to another program.