I always find QB, whether QBO or QBD, to be a PITA and incorrect for 1099 mappings. If you get them correct, great. Sometimes it is quicker to just review vendor payments and then create two accounts that clear each other out, and do a journal entry that has each vendor as a separate line. You then map the debit accounts to 1099 boxes, and sum of debit boxes is offset by a credit account. Another way is just create a single account, and assign the credit account to either no vendor or a CPA Adjustment vendor.
I end up having to do this more often than not. 1099 accuracy/mapping has ALWAYS been a weakness of Quickbooks.