Sounds like there could be another harvest record somewhere. Try going to the Accounting-GL-Accrual Reports-GL detail report. Enter correct date range. Check the box to include voided and voiding transactions. From the right scroll to the Asset/Inventory-harvest crop section and check the box for the correct Commodity account. Click Print. This report should explain where the qty amounts from inventory are coming from.
Another thing to check is there a negative qty amount showing on the inventory or a lesser amount in another location to compensate for this positive you have. You can always go to the Help Menu and type the Letter A, yes to round the GL. Then Type the letter F and if getting any messages click OK. Then go back to see what your harvested crop inventories look like.