A Microsoft file hosting and synchronization service.
Dear Chris,
Good day! Thanks for posting in the community. We are happy to help you.
According to your description, the situation happens to multiple users and happens when moving files to a specific library. Based on my search, I haven't found any built-in settings that will cause this situation. Please contact your admin/IT department and let them create a support ticket via Microsoft 365 Admin Center> Support> New service request. That support team there will have the correct channel and resources to help you investigate more and find what exactly the reason has caused this situation.
Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator