I've found while playing a few games that for some units their hats and helmets aren't on straight, like completely on the side of their face. Main units that I see this happen to include grenadiers in all ages, highlanders after upgrading to guard and imperial, redcoats in imperial, and standard musketeers with guard and imperial. I do not know if there are other units that have this problem. Sorry if this was already mentioned somewhere else.
"It is the mark of an educated mind to be able to entertain a thought without accepting it."