How is it legally murky? Someone asks if that’s your signature on the document and do you remember signing it, and it is and you do, so you say yes. End of discussion.

It’s only a problem if you’re claiming it’s not your signature. But then, they have to prove it’s your signature, you don’t have to prove it’s not. I’m not sure you can prove it’s not your signature, hence burden of proof being on the other party.