I’ve personally never seen this happen before and couldn’t find any posts about this issue. Could possibly have been an issue with your internet / TU servers? has the issue resolved itself since then?
Please try removing ClientPlayerData2 folder from your game’s install.
To do this, first launch Tower Unite in windowed mode.
Then right click on Tower Unite in Steam and go to Manage > Browse Local Files... and go into Tower/ and remove ClientPlayerData2. Then restart your game.