Amigurumi too short...?

[Caitlin87]

Hi everyone,

I'm looking for some advice. I've been crocheting for about a week and today completed my first amigurumi. It is well formed etc but it has turned out half the height it was supposed to be. I think the width is correct, which would suggest to me that I had got the UK double crochet wrong and done a single instead, but I'm fairly sure I've done it right...

I also thought that when the pattern said to double crochet twice into the same space (to increase the spiral) that maybe I was supposed to build the second dc on top of the first, but that wouldn't increase the spiral....

Is there any reason my amigurumi might have turned about correct in circumference but wrong in height?

Thank you!