That means, of course, that there is something different in your main account than in the new admin account.
There are a lot of possibilities as to what that "something different" is. Sometimes a corrupted preferences file can be the cause. In Finder you might try holding down the option key and Go > Library > Preferences and moving com.apple.applescript.plist to the Desktop, then reopening Numbers. If that works, delete com.apple.applescript.plist from the Desktop.
You could also sign into your main account and at System Preferences > iCloud sign out and then back in again. Make sure iCloud Drive is checked and, behind the Options... button, also make sure Numbers.app is checked.
SG