The due date is being changed for some tasks created in D365.
The users create a new task accepting the default 8:00 am and saving. Users with the D365 for Outlook app see the task as originally created in Outlook.
Later, the users notice their task has an incorrect due date when viewed in D365, in the past and outside their normal working hours. The Modified By shows the user.
These are experienced users working in a familiar process, suddenly getting different results.
The users with the Outlook app still see the due date correct in Outlook.