Bug, glitch or what is it

Hello everyone!)) I
ran into a problem - I passed the first "easy" difficulty mode, the second "normal" mode opened, it also passed, after the credits there appears an inscription that the third "hard" mode is open, the boss mode and two characters ... but after pressing "continue", the game returns to the menu and there is the third difficulty mode, the boss mode and the characters are closed, like "go through the normal mode", but I have already gone through it 10 times ... ((
Who knows how to fix it ?! And then Google is silent on this matter ...
Thank you all for your attention!))