Recent message move issue in Outlook 365 shared mailbox

Starting around Monday 5/12 (could have been over the weekend) we're seeing behavior where moving an email from one folder to another in a shared mailbox is appearing to move correctly in Outlook software (classic enterprise version) but not reflecting in web view. This creates a duplicate of sorts and have to address on the web side.

Same behavior with two different accounts that have access to the same shared mailbox on newest (current channel) and slightly older version of 365 software.

When using python automation that has worked for months, it's now effectively creating a copy from Inbox in our In Progress folder, and a 3rd copy in Done folder. When processing cycle hits again, it's reprocessing (bad) and creating a mess of duplicates.

Anyone else experiencing this or have any idea what may have happened or how to resolve? 

Thanks

jt