Just at the right of the big "Vancouver" there is a blue span [edit|edit source] which in my opinion should not be there:
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Description
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Comment Actions
I just had it again.
It is shown only immediately after you edit a page. Refreshing makes it disappear.
Comment Actions
I have found the reason.
pagebanner is incompatible with the gadget "Add an [edit] link for the lead section of a page" in Preferences.
Disabling this gadget fixes the problem.