whats wrong in Qxa8 move winning Rook(1994 British championship match)

From here, the game continued with 14.Qxc7 ... Bxc7 , which moves both the Queen's out of the board. My question is : what is wrong in playing the move  14.Qxa8 ? This would win the Rook (and keep the two Queens on the board) and white would be ahead 5points. One thing that I could guess is that probably the Queen might be in trouble after capturing the Rook, but I could'nt find how.

This is  a game from 1994 British championship, with Keith Arkell playing as black.

Thanks.

After 14.Qxa8 black can play 14...Qxc1+ then after 15.Ke2 then 15...Qxh1 and black is ahead a piece

If 14.Qxa8, then 14. ... Qxc1+ looks kinda nasty to me.

Edit: To slow, lol

...Qxc1+ is what's wrong with it.