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As of the newest patch on console "ver 1.20"
They are still jumping around and teleporting. They also seem to be going back to where my Sim was when I clicked the action rather than where we are when the Sims are together.
My Sims have also been doing this. They'll be heading to do whatever action and suddenly teleport to a different area then reappear and continue on their merry way.
Nothing game-breaking but definitely weird and annoying.
I thought this was due to the save file I've been playing the last year or so is very big (like 300-400 played sims), but now I saw it in a save file that I just created. And my computer is quite a good one.