Posts from Luck is not on your side.

My luck stat is 6 or higher.

After several battles, I noticed that it doesn't seem to be applying. I've been playing the same map against the AI for many days. I've been constantly reloading saves.

In the turn-based mode (on the map), the hero's luck stat shows 6 or higher. When a battle starts, my luck stat is 0.

Before this, I was playing normally for days, and suddenly this bug appeared. Unfortunately, restarting the game didn't help.

Any ideas what might be causing this and how to fix it?

Most likely, there was a week of bad luck where the game mechanics didn't favor you. Or you installed a map or a mod (try clearing the maps and mods folder).