First, see this ticket: http://ministry.kronosaur.com/record.hexm?id=2366
That ticket now applies to combatStyle="advanced" at the very least. It isn’t as noticeable, but it does happen. I haven’t had a chance check any of the others, but they would probably be worth looking into.
Fixed in 1.8 Alpha 1. See also: https://ministry.kronosaur.com/record.hexm?id=70161
Only reopening this to make sure this question doesn’t get lost in the shuffle, so go ahead and close it back. Does this fix also fix the issue on the linked ticket? If so, that one also needs resolved.
No, it doesn't fix that ticket, which is why I left it open.
Reopening. Somewhat better, but not quite fixed. Mostly it seems to be happening when they’re getting close to their target, at which point they’ll start accelerating backward to maintain a specific distance.