Dear ITrccab
Good day! Thank you for posting in the Microsoft Community. We'll be happy to help!
First of all, we regret for the inconvenience and inconvenience caused to your work. Based on your description, I have a general understanding of your question, it seems that you say that your user's problem occurs in OWA (Outlook web app), if so please kindly try to clean the cache of the browser she/he is using first, and if there is still a problem then please kindly try switching between other browsers and log in to OWA (Outlook web app) in the privacy mode of the other browser (incognito mode) to check the results.
If your user's problem persists, given that your user's issue is happening with OWA, because our forum lacks relevant knowledge and permissions to fix OWA problem, so to better help you and not waste more time, please kindly try to create a service ticket in the Microsoft 365 admin center to support > service requests through navigation, as they have more access permissions than on this forum, and professional engineers will further help you.
Note: if you are not using admin account, please kindly ask admin within your organization for help.
Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope all the best!
Sincerely
Kerry Chen | Community Moderator