I have a large map I'm working on that's doing a strange thing ever since AI CC's last update (21.1.0).

After the update, Illustrator seemed to change the "Arrowheads" (circles in the case of this file) position at the end of SOME, but not all, of my lines. As far as I could tell, the unwanted and automatic change was completely random. Worse yet, it seems to be continuing at random, as though AI has developed an AI intended to drive me insane.

Anyone else experiencing this? (In the sample screenshot, the circles at the ends of the lines representing Bronco, Arabian, and Palomino cul-de-sacs were created in Illustrator before the Creative Cloud's last update to stop before they encroached on the streets' labels. Note, however, the myriad cul-de-sacs to the right of these remain as they were intended.)