Event Title in Outlook Calendar Defaulting to the sentence "Face to Face"

Hi

There are 4 users in the same team with an issue. 

Whenever they create an event both in the outlook client and web client the event will change the title of the event to "Face to Face" after saving.

There are no rules in place and there are no tags with the word "face to face".

Any idea what it might be?

I setup a fake event called "test" after about a min it changes to "Face to Face" ?