If you accept a club's proposal for a player under his details you get to see transfer proposals and usually you can amend this before the deal is completed to any amount you want. This isn't happening it goes through at the agreed price
I have looked at some transfers offers and they seem to show twice on the transfer proposals in the player's details
I will check out some other transfer offers not just my players and update you
also noticed another issue in that if I open up future transfer list and swap a player ie change one from the list to anyone else the transfer goes through but no money shows up to the selling club. I haven't checked if money leaves the buying club. Think this was a bug in FMRTE12/13