To resolve this, you have to go to the person that delegated their outlook and change the permissions. Uncheck where it says “Delegate receives copies of meeting-related messages sent to me”

To get there: Click File in Outlook: 

Then Click on Account Settings.

Next Click Delegate Access:
 
 
Next Double Click the user name, in Here it will show
Then Uncheck where it says “Delegate receives copies of meeting-related messages sent to me” 



And then click Okay.