“1920 x 1080 is not anamorphic. Did you collapse the multiclip when you were done with the edit?”
Nope wasn’t anamorphic till it entered the new timeline at 720×486. Without clicking anamorphic on the sequence the footage is squeezed even more. When I finished with the multiclip edits I rendered them. After rendering FCP wouldn’t allow me to go back and edit in multiclip. So, to answer your question yes.