I was approaching to buy Enyeama. His agent asked me to be make an offer first, before revealing his clients demands. so I did. AND after that this happened (see screenshot below).
it's happened to me several times - trying to sign players to Bury and to Dinamo.
it could be your club's reputation and the fact that 7.5k is far under his expectations.
always scout them before to see approximately what wages they'd be after.