Like stated before such problems are usually caused by IK being on for the hands or for the feet or that the pose is not for the figure that you are currently using.  You may want to apply the pose with the limit on just to see if that corrects the issue.

The only other thing that I could think that may be causing the problem is that the pose itself is actually messed up. If all of your other poses in the package are working fine then it may be that one pose that's not the correct pose for the the thumbnail being displayed.