The problem can be seen in the screenshot; it would be fine if we didn't see the available cells for the turn, but they also leave their illusion in the previous location, and soon this screen bug causes
this to happen.
It's as if the texture catalog is half empty.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html