QB created a transaction

Last year we closed a checking account. The balance was not zeroed out in QB but was left with a negative balance for the last check written out of the account to close the account.

A new checking account was established, and things have been working fine in QB until recently. Two months ago we deleted a random entry that was not accurate that reflected that negative balance.

Now, upon trying to reconcile our accounts, I found that QB created a transaction-- a check in the amount of that negative balance in the old account with the memo "Created by QB Online to adjust balance for deletion."

It is creating a double entry/fake transaction for that same amount out of one of our accounts (so there are two of the exact same entries but both are going to different accounts- one to the closed account, the other to the correct account.) I am unable to delete the fake transaction because it says that will create a non-zero balance in the closed account. Why won't it let me override that?? We have lived happily with a negative balance in that account for months. Why the trouble now? I can't reconcile my last account because of this. 

Thanks for the help!