When traveling from the overworld to the nether in a portal.   You appear at the same cords in the nether as the overworld portal, instead of the linked nether portal.  There is no portal where you appear in the nether.

So if your portal is at 4000 by -1000 in the overworld, you appear at 4000 by -1000 in the nether instead of 500 by -125. 

This has now happened to 4 people since the update on our realm.

1. MCPE-54894 similar