Is it save to delete the value stored in dragSortOrder?
If you are comfortable with MySQL queries you can also try just setting dragSortOrder to the value of product_ID like this:
UPDATE cmsb_products SET dragSortOrder = product_ID;
Or if you need to sort in the reverse order you can minus from a number you're sure is greater than the highest product_ID
UPDATE cmsb_products SET dragSortOrder = 10000 - product_ID;
Let me know if that works for you!