count your stitches!! If the pattern is correct (and that is a BIG IF) then that could be your problem. I am not the biggest fan of Leisure Arts... ahem- off topic I know.
If your stitch count is correct- look up Leisure Arts pattern online, and see if they have any errata.corrections for this pattern. When I find that the pattern is not "acting right", I often find a correction has been made. Especially if it is a printed pattern.