The Canaries came from 1-0 down to win 3-1 at Carrow Road.
Rat told whufc.com: "It is difficult to think how we lost the game after the first half, in which we played very well, had a lot of chances and controlled the game. It's amazing how we lost it.
"It should have been all over by half-time, if we had scored the second goal and maybe a third one, it would have been hard for Norwich, but I think this is our problem - we created a lot of chances, but we hit the target not too often. We need to improve on that.
"We have a good team and we demonstrated that in the first half on Saturday, at Swansea, at Tottenham.
"If you make a review of all our performances and all the points we've lost, it's really unbelievable."
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