I keep having this problem where enemies will skip their turn for no reason, they have no status effects, it doesn't say "Action Points Saved", I can see them and vice versa, and they have a clear path and line of sight to a target. Is this a bug or is there some other explanation? At the moment, though I love this game despite only playing it for a short time, I don't really want to play it with this being unexplained because if it's a bug it would make fights feel very cheap indeed.

I've spotted this once or twice my self. Usually if the terrain and fight is complicated, never seen it happen in open/clear areas.

It can happen if they are blind or there is a fog area.

It kept happening in the tutorial tomb, so I don't think it was any status effects.