I had that. I was offered about 30% less than I was asking for. I was told that the couple were struggling to rise the money, but that wasn't my problem - I had a mortgage to clear and wanted to come out of it with money in the bank, rather than an overdraft!
They eventually offered me about 15% less and I grudgingly accepted
that offer since there weren't many others and I needed to sell.
It turns out that they must have been having
REAL problems because
over 4 years later they
still haven't finished the repairs to the property or moved in!