That's weird. I mean, I can tell the content was written by myself. I did correct spelling and grammar using Word, though. Could it have been the integrated Co-Pilot AI "plugin" ? New versions of Microsoft Office have Co-Pilot integrated on them. That might be the culprit.
This is not a case of correcting a helping verb. All major detectors are detecting almost 100% AI detections for your recent posts. What is more surprising is that it is a sudden change, I will refrain from commenting further without proof.