Dunno if this has been noted or not, but it looks like if Return to Unit Placement from Attack is On and Return to Attack from Fortify is Off, then when you make your maximum number of Fortifies the player does not end your turn automatically, it makes you click the Green End Turn button.
A cure? Three simple molecules? Building for the small? Compassion for children?
Seek Yours Today. Get Uncomfortable.
I just saw this myself and noticed for the first time.
I blame your map Yertle; you must've broken something.