I can’t log in on instagram and with the same password i can Log in on for example my Mother’s phone

Hi there, Beerentsnick!
Thanks for reaching out to the Apple Support Communities! It sounds like you are having issues logging into Instagram on your iPhone and I am happy to help! Check out this article with steps to follow If an app unexpectedly quits, stops responding, or won’t open. This article will give you the best steps to troubleshoot issues with apps, including steps to take if you continue to have issues.
Take care!