It means you have two completely identical url links somewhere in the post. You'll have to scan through and work out what they are, and remove one (if they're links to the same thread, you can mitigate it by linking one or both to different exact posts in the thread, not sure what to do if it's a pet. Link one to the let page and the other to their prof page or something I guess.)

But if I post another temperlink below it, then the one above goes back to normal... Like the vene I showed in the original post, I temperlinked a nixi below it and then the nixi had that problem, but the vene was fine.

when there's two identical links it REALLY messes with the things- it ignores the second one and overwrites it so it goes to wherever the next link in the tread goes, and basically shifts all the links after in turn.

so if it was [link1] [link2] [link1] [link3] [link4] [link5] it'd become [link1] [link2] [link1 link3] [link3 link4] [link4 link5] [link5 templinkreplace]

I see...
Maybe so, but in this case I was c&p from another post into this one (as part of the new post) and the old one had 0 problems. This one on the other hand does.

Oh!!! I found it!! I had put 2 of the same link by accident... I linked one of the pets above as an example... Ty for answering this ^-^