If your GST and account data do not match, then you need to check the below reasons:
1. You need to update the GST summary from the Houseking option.
2. You need to update the BUSY release to the latest version.
3. Also, you need to check the audit report from Display, then select GST Reports, then select GST Audit Reports, then select Reconcile Accounts & GST, then select the sale purchase and account voucher, then select the date range, and load the report by pressing the F2 or OK keys.
The above reason will help with GST and account data.