Are you using your phone? Try a different device with the same password.
Otherwise have you shared your account details with anyone?
I have not shared my password, I only unfollowed many profiles manually. I am staying off the app 48 hours, hope it works. I just find it very very stupid that I cannot decide to “clean” my list of followed accounts. It is my rental holiday home account, very small and always used correctly. It has less than 1k followers. I am so gutted :((((