There are a couple of possible scenarios here.
First, it is usual for financial institutions to raise those fees, although most don’t apply them to payments made from savings/cheque accounts as opposed to from credit accounts. So far as I’m aware, the fees are either paid by the payer at the time of the transaction, or the payee or “merchant” can make those payments and absorb them, or make them and pass them on. So could it be that your Owners Corporation is making those fee payments and showing them as bank fees on the Accounts?
Secondly, if you have a Strata Manager (SM), they could have negotiated the B’Pay™ facility with their financial institution and it could be the SM’s fee for managing that facility that appears in your Owners Corporation’s accounts. I’m thinking that this could be the case, as “processing fees” for payments made by EFT are not usually made by financial institutions directly.
If you can clarify the source of the fees as opposed to what they’re for, I’m sure that contributors to this forum will provide further advice/comment.