Sending, receiving, and organizing email in Outlook.com
You gotta just keep clearing the cache on the browser you're using for Outlook (the issue will likely eventually crop up in Safari as well; various users on this thread, and this one, have reported the issue on other browsers including Microsoft Edge).
The quickest way to actually deal with the root cause of the issue would be to change your major to Computer Science, get your degree, get a job at Microsoft, get transferred to the team that owns Outlook, and roll back the release that went to Production around the end of January 2025.