One potential cause for the mismatch is a discrepancy in the dimensions of the analyzed data.
It’s also possible that the data pulled from GA may not be up-to-date with the data displayed in GA, creating a false reading. To remedy this situation, verify that you’re analyzing the same dimensions. If this is the case, try rerunning the import.
If neither of these issues is the cause, you can try deleting the tables and re-importing the data.