Hero Lab behaves exactly like our Army Builder product with regards to this issue. Please see the following two threads for details on what's going on and how to resolve the problem.
http://forums.wolflair.com/showthread.php?t=9545
http://forums.wolflair.com/showthread.php?t=9340
My latest post in the second thread delves into some more subtle issues that could be at play given your description above. Please take a look at these threads and see if this gets you sorted out. If not, please let me know and I'll do my best to help out further.