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We have a couple of admin assistance who schedule a fair amount of meetings for our upper management... at some times, there are up to 3 email invites sent to the invitees with the following process (in the process of confirming this with one of the admin assts):
1. Recurring meeting created as a regular meeting (not a Live Meeting), with some users added. This is not yet sent to the invitees. 2. At a later date, the meeting is turned into a Live Meeting. 3. Additional users are added, some given presenter perms. 4. The planner is sent. 5. Invitees receive multiple messages. 1 to accept, 1 or more to remove from the Calendar.
I have also noticed similar issues when using the web scheduler to send invites as well.