Cannot unhide creatures

On a board I am using for my game I am unable to unhide any creatures that I hide. Bringing up the rotary menu is no problem; selecting hide creature is no problem. But when it comes to trying to bring it back…big problem. In the GM overlay the creatures just appear as a white figure that cannot be selected. I am not having this issue on any of my other boards I am using in my game. Just this one. Going out of the board and coming back in does not fix on reload. Just some weird glitch that won’t go away.