@Milady017 Well, let's start by saying that you shouldn't force a reconciliation any more than you should force a crossword puzzle to work. It never ends well.
It's fairly likely that it has something to do with how you established the beginning balance of the new account, per your description, though I would suspect a misreading of the deductions and additions for October more. We've all been there.
After all, it's just math. If October's starting balance and ending balance were set correctly for the reconciliation, then either you didn't read the deductions and additions correctly, something got mucked up with September's reconciliation without you noticing (probably when you established the balance), you somehow picked the wrong bank account to reconcile, or QBO is eating itself.
While the last option is always possible, it's also not something you can hope to fix by yourself, so you should focus on the other possibilities for now.
