Tiktok acc posted video I didnt post

Hi. Last night my account posted one of those AI generated story time videos. I did not post that! I changed my email and password, and the next morning it happened again. No other known devic3s on this account, other than the phone I was currently using. I changed my email and password AGAIN, but Im worried its going to happen for a third time. Id really appreciate some insight as to why this is happening or what I can do to prevent it at a maximum. I asked Tiktok support but it was just an AI chatbot that was useless. Thank you🙏