Can you give me a little more information? Did you edit that reference in VisualEditor or did it corrupt a reference you didn't at all touch? Was the only change made to the page the added link at the top?
This will help me debug; I am trying to see if there was an issue with the way VE sent the data to Parsoid.
@Mooeypoo: I've tried to reproduce the issue but haven't been able to either. I'm not the one who made the change, it's just something I noticed as I was reviewing edits made with VE.
I've contacted the user who made the change to ask if they could share their browser & OS information to help us debug this. I'll let you know if they respond.