I was checking this record and I found out that it was attached to someone obviously not related to it. See the second item on the right panel. I went to that profile and this record is not in the list of sources.
Yes, this is a bug. I have reported several instances of it. Engineers are aware and working on a fix.
That said, the bug is not in the Source Linker. It is in the index record display system, which here is incorrectly showing that a similar record for Juan Artieda is attached to MTK4-5QQ William Gray. In fact, the record is not attached to him. It probably is attached to M4GD-ZF6 Juan Artieda.
I am looking at the same index record now, and William Gray is gone. So that's progress; when I first reported this bug these glitches were persistent.