the only option you have is to manually edit each transaction and delete them.
the easiest would be to drill down which transactions were entered wrongly and correcting only them.
whatever you do, make sure you backup your business first.
now i feel like i am a bit dumb.
i had asked @Tut the same question on another topic, but where do i find this batch delete button for bank accounts or bank transactions? i do not find this on 18.1.84
I don’t recall you asking this, @sharpdrivetek, but I would have steered you toward the solution you found on your own. There is also a Guide: Manager Guides.
EDIT: After writing this, I saw the other topic, which I did not respond to because I hadn’t seen it yet.