Unread Count wrong on folders marked "Favourites"

There’s a bug affecting my eM Client. I wonder if it affects others and if support could do something about it?

The Unread Count on my “Favourite” folders is usually incorrect. The same folders in the main folder list (underneath “Favourites”) reads accurately. Why does the same folder show (right now, for example) 2 unread emails in the folder list, but 0 unread in the “Favourites” list?

How can this be corrected?

Thank you