Go to:
https://www.facebook.com/pages
Click on: INVITES (next to Top Suggestions)
You will see the invites from those that have added you as ADMIN/MANAGER.
PERMANENT SOLUTION:
(Under your Personal Profile)
Click on gear and go to > Privacy Settings
On right side, click on > Privacy
Find > Who can look me up
Edit > Who can look you up using the email address you provided?
Set to > PUBLIC