Yeah it seems to be a recent issue that happens to Google Chrome users who decided to add Hitmanforum to their devices. Funny how mine didn’t have such issue until I opened it once @DrMekar asked about the same issue a week ago. But that’s probably just because I barely used it and mainly use my laptop to log on here. Then just like Mekar and you mentioned, reinstalling it seems to solve the issue.
I would think this is more of a Chrome issue, rather than the hitmanforum app itself.