Messaging problems. App shows messages for item, website does not.

Level 1
I receive offers for my items and I reply but I never hear back and when I go to the OfferUp website, it says no messages for this item. App shows messages, website does not.
Level 9
If you never hear back, they lost interest and don't have the decency to update.

New Member
I have the opposite issue in that I received an email but it’s not showing in my app messages.
Level 3
My problem it shows the tag makes the cha ching sound but when go to app no messages. Any one else having this problem?