Known Seed in which it can be replicated (haven't successfully tried others):

-1963576890

Overworld Portal coordinates:

281-284 (4 blocks wide), 61, -16 

Replicate issue by:

1. Building a portal at the coordinates above (not far from spawn).
2. Light and enter portal.
3. Walk around, at least going down the soul soil/sand hill on which you enter (Nether Coordinates ~37, 49, 15
4. Climb back up the hill re-enter the portal from the Nether.
5. Player will return to Overworld at coordinates 305, 68, 17

One wonders if the sign is getting swapped somehow (bolded above for emphasis).

Demonstration video:
https://1drv.ms/v/s!Apr73Jy6zWsqskUmCBUy8Mi6jcjg?e=Zfnzv8