Current questions and answers regarding the map editor.

Yes, it would be good to double-check if the correct animation is set, and just in case, also set the arena model, because sometimes the arena animation doesn't work well with the LOD model.

Added 2 minutes ago
And the maps are probably not the issue. After all, the changes in your map were the last ones, and it is these changes that are taken into account.

But there were no changes in this regard. I tried doing this, setting the arena model and the arena animation set. The result was the same. I also noticed another strange thing, I don't know where it came from. When I launch startcombat with ordinary human heroes (like Dugald, for example), the icons and everything else are as they should be, but their model suddenly changes!!! Elaine turned into Isabelle, Dugald into a renegade hero, and so on. Of course, I didn't change anything myself. It doesn't affect the gameplay, but visually it's not very good.