AI detective tools can be wrong but if many tools say your post is AI-generated with high percent, it's red flag. It can be plagiarism if you actually use AI and don't say about it publicly in your post.

The point is your content possibly not good in quality too and if you have many "possible" AI-generated, low quality posts, you are not a good poster. You can improve and become a better member, but you can choose to be what you are now. The advice is if you won't improve, you won't go to higher ranks because merit system is to prevent spammers ranking up.