This is a basic understanding in virtually every fantasy league on this site. I noted this in a league-wide PM I sent out on January 8th. Under no circumstances is anyone allowed to edit a bid.
No one wants anyone to be subjected to a heavy handed penalty (like disqualification from further bidding on that player), but please understand the "Pandora's Box" that is opened when someone does this.
A GM may do it with good intentions, but how is anyone to know? Was it done to reduce a bid? Increase a bid? Or done knowingly so a GM would be relieved of an obligation to that player? Regardless of the reason, editing a bid is not allowed. I am not accusing anyone of misconduct, nor am I attempting to shame anyone, I just believe we have to follow some basic protocol or we are going to have issues evolve that could easily be avoided.
Again, so it's clear, a posted bid is final, so please take care in posting future bids.