Hi Kelen!
Do you mean when you play a Little Math lesson, some of the numbers are not shown on screen (either the numerals or the the quantity icons), or you are missing some lessons in the Curriculum (ex: instead of having Day 1 to 130, you only have Day 1 to 10)?
In case you are currently using an old version of Little Math, I suggest that you upgrade to the latest version (v1.6.370). Simply visit your Account Management page (go to "Purchases > Little Math") to download the installer for the latest version. For detailed instructions, please refer to this article:
http://support.brillkids.com/index.php/article/little-math-install-and-setup-from-account(Note that you don't need to uninstall your current LM before installing the newer one)
After upgrading your LM, try playing any lesson and see if the problem was fixed. If there are still some missing numbers, kindly send us a Diagnostic Report. For instructions on how to create a report, do have a look at this article:
http://support.brillkids.com/index.php/article/little-math-reporting-bugs