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It sounds like you may need to uninstall and reinstall the Numbers application.
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The iWork apps don't do well being moved from one disk to another, whether that is a Time Machine back up or another Mac. It is always best to install again from the original source & it is best to start by removing what you've already installed or copied. The files to delete are the iWork ’09 folder from the main HD > Applications; the iWork ’09 folder in HD > Library > Application Support & the individual iWork application plist files found in HD > Users > (your account) > Library > Preferences for each user. The easiest way to fix the problem is to use Yvan Koenig's AppleScript that removes the files. I have put a copy on my Box.com account in the iWork folder. Download uninstall iWork '09.zip, decompress it, open it in AppleScript Editor and click the Run button.