Character Skipping Since Patch, No Lag

Ever since the last patch characters (mine, and allies/enemies) will randomly skip locations, almost like the game client is out of sync by ~.5 second and occasionally has to "catch up" to update the actual position of champions. I'm 99% certain it's not latency/packet loss related as I'm keenly aware of what that looks like having dealt with it regularly before changing internet. This doesn't happen all the time, maybe once a minute or so? It seems either server side or something funky got changed with the game code. I would think if it were either of these it would be affecting more players, however, so I'm at a loss.

It is doing this on both ARAM and Rift.

Appreciate any help you could provide. Thanks!

EDIT: Skill cooldown timers are also appearing off. Was just playing on ARAM and her ult instantly jumped from 6s cooldown remaining to immediately available. May be a separate bug, but I've gone a couple years now without seeing any significant bugs and now all of a sudden both appear right after a patch?