Why did Deline suggest the wrong account for a bank payment?

Where do suggestions come from?

• Last time: …: you recorded the same payee to that account before. "… was recorded to this account … times, most recently on …. Nothing changes until you press Record." Press Record it the same way only if it fits.
• The bank's card category: "Your bank calls this: … . That is usually an expense." "It is only a hint. Nothing changes until you press Record."

I pressed it by mistake. What now?

Right after choosing, press Undo. If the line is already recorded, open it in Reconcile and press Undo: the books post the exact opposite entry and the line is ready to record again.

Will it keep suggesting the wrong account?

Suggestions come from your earlier recordings of the same payee in this business. Recording the payee to the right account from now on is what changes them.