Do not use that saipling tool because it is definitely one of the worst that exists, and in fact most of the text (posts) you check with it will be detected as AI content. If you don't use at least 3 different detection tools, there is no point in publishing results at all, but when every AI detector shows AI in someone's posts, then it most likely cannot be a mistake.
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My problem could be with the grammarly keyboard I'm using; English is not my native language, so I use the grammarly keyboard to fix and improve my phrases after they've been written. It's possible that these AI detector sites picked up most of posts enhanced by Grammarly keyboards. I do not know. @powerGlove is this possible? I know you're a tech wizard.
Shouldn't that tool only check for spelling mistakes? If you use it to get completely artificially constructed whole or parts of sentences, then AI detectors may detect them. Whatever you've been doing until now, I think you should change the way you create content on the forum - because English is not the native language of most forum members, but we try our best and with time most of us get better.