AI detectors can give false positives. The main goal is not to get the most count in catching AI posters, the main goal is to catch those who are definitely using AI bots for their posts and to demotivate others. So we want to be sure that someone uses AI for posting: so several AI detectors should say so about several posts of a user.

You can try to report some post if you are sure, but moderators can have own conclusions about that.