Hi, Most probably it might be a sequencing issue how you are running WIP, Variance and settlement.
You can check the orders that has left over balance on WIP account has WIP reversal or not?
If there is no WIP reversal, you are not running the WIP after updating the orders with DLV/TECO status, instead you might directly calculating the variance and settling the same. In such cases, the calculated WIP balance will not be reversed in next month while you are directly calculating the variances and the balance will remain in the WIP account.
Please confirm if this helps to understand your issue.
Regards,
Srinath