Outlook Personal calendar to Shared Calendar

Dear All,

I have been experiencing an odd behavior when it comes to copying meetings from the personal calendar to the shared one. It used to be a simple task (drag and drop and that was it). Our shared calendar has an owner (not me) and the 5 of us sharing it have all the same permissions ("can edit" for the sake of clarity). 

As of now, when i try to copy one meeting from the personal calendar to the shared one...it will pop up the meeting request with all the attendees (that had already accepted or rejected the event) instead of executing the "once fairly straightforward simple task" (drag and drop). I don´t want to send another invitation; I just want to copy the meeting to the shared calendar. 

I am the only one facing the issues; my colleagues, with the very same permissions, continue to drag and drop the meetings (shared calendar) without any issues.  

What am i missing here? 

Thanks in advance!

Joao (using Microsoft 365 Apps for enterprise)