Two accounts on TikTok with Apple

My TikTok app was working slowly so I deleted that app and downloaded it again. When I tried to log in again with my Apple account, I ended up with a different account with a different username. However, I logged in with my Apple account/Apple ID, but always ended up with a different account. Then yesterday I tried to use my private email because Apple says it is connected to that, but I had to verify that email that is normally connected to my regular email address. My private email doesn't send that code to my connected regular email so I can't verify my original account. I've been trying this for a long time but I just can't get into my original account anymore, I get into a different account every time. How can this be solved?