Hi Mchv2.0,
May I confirm the following information to look into the issue?
1. The mobile device, operating system version and browser version you use when experiencing the issue.
2. Have you tried with different browsers and mobile devices?
3. Have you tried on different SharePoint Online sites?
Besides, I’d like to collect some information about your tenant for further investigation. To protect your privacy, I have sent you a private message to collect it. You can access the it via this link:
https://community.office365.com/en-us/user/conversations.
Thanks,
Eric Yang