"HW rulez" mod (add-on) for HoMM3.

Could it be that "Tab" was pressed?

Hellight told me that this might be a bug with the chat window.
It's just a tournament game in the favorites, and it's already late game, and this situation has repeated 3 times after passing the turn.

I will, of course, check the "Tab" key, but what should I do if that's not the problem?