I noticed this before the x7.7 update. Not sure if it is an endnote problem or Pubmed though. If I put in the same search in pubmed, I think I get the same 21 records returned as I do with your settings in Endnote.
((fibroid[Title]) OR uterine artery embolization[Title]) AND (“2016/9”[Date - Create] : “2016/9”[Date - Create])
I think Pubmed is returning records it shouldn’t.