Has anyone come accross this before?

Memory Smith

Pay careful attention to the ID numbers, please. How should I go about fixing it?

https://www.familysearch.org/tree/person/details/LX96-SLK

Memory Smith

Correction

Pay careful attention to the ID numbers, please. How should I go about fixing it?

https://www.familysearch.org/search/linker?ark=/ark:/61903/1:1:62MZ-V2RF&id=LX96-SLK&hinting=/tree/person/details/LX96-SLK

Áine Ní Donnghaile

Yes, I've seen it before - often.

The record index has been cross-threaded - the index for the mother has been attached to the father with the index for the father attached to the mother. It's an easy fix. Simply click the 2 "Detach" options and then re-attach to the correct parties.