I don't know how this could have happened but I'll try to help. I assume simply clearing all cache and reloading the page does not help. Have you tried to delete section 11 multiple times? Any change?
Could you log in with your sql client and run this query: "select id,name from ezsection;" and post the result. Also please do the same with these two: "select count( id ) from ezcontentobject where section_id=10;" and "select count( id ) from ezcontentobject where section_id=11;"
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