My XP Reset Itself

A while ago when playing Tower Unite with a friend, I noticed that my experience was lower than I originally had it at. This went for many things I would normally play on there (Plaza, Virus, etc.)

But even with my experience reset, I still had all the items that I got with leveling up. Luckily, I searched up this issue that I have with the game and other people have had this problem occur to them as well.

How can I have this resolved?