Inbox completely messed up
 

Probably not that big of a deal for most people but random messages in my inbox become unread after every simulation, as well as deleted messages re-appearing in my inbox unread. Along with that is the previous duplicate message I mentioned that doesn't go unread unless you delete it

I have a different but probably related problem. It suddenly appeared last season, went away after season end and now it's back... the dreaded phantom mail:

I have an unread mail notification but there are no mails to read. Won't go away until end of season, I believe.https://i.imgur.com/fcUjJT6.jpg

It goes away if you delete duplicate messages. You can click on the filter and choose unread messages.

We are not sure what is happening here.

I have 14 unread messages I can never mark as read
 

Here is a screen shot of the 14 unread messages I have every time I load the game, if that helps. I click on all of them every time I log into Perfect Team, but they never get marked as "read."

Do you have to click submit team after reading for messages to count as read? I thought that is what was happening on my end but I didn't pay close attention.

Yes you do.