The difference with respect to the exit poll is claimed to be due to the postal votes not being included. In the 3 results declared so far, it looks like the Tories have gained from UKIP's loss.
https://twitter.com/BBCPeterH/status/872925278909194244?ref_src=twsrc%5Etfw&ref_url=http%3A%2F%2Fwww.bbc.co.uk%2Fnews%2Flive%2Felection-2017-40171454
"Conservatives in Southampton say exit polls often accurate & not very encouraging. Itchen most marginal seat in south, Test is Labour target"
Give us the whole tweet;
"I think exit poll is flattering Labour in small towns. But if right, May has to resign - she has squandered a majority. Brexit - shambles"
The quality of the respective political leadership groups, and the standard of debate and knowledge amongst both the candidates and those publicly promoting them, make me despair for the state of this country's democracy.