When you have the Krax blood ability (fortification), the unit will prefer to stay in place fortified, instead of moving to block the way to the archers, and then fortifying.

Enemies seem to hit quite a lot at low numbers (~75 accuracy against my 65 dodge). It might be RNG, but worth checking.

A bug where you can enter a goodie hut without killing the monster on it. I think it happens because of multithreading, as well as other similar bugs (engaging an enemy unit and moving before the battle commence, and such).

In some cases, you don't have any research. I believe it happens if you load a save from a turn where you completed a research, and the popup fails to load in order for you to pick a new tech.