and the way your bank are processing it means they are able to make more money from you.
some banks lodge the trs into your mortgage account usually as soon as they get it, usually the 1st of the month.
if this is the case it means that your mortgage has already been reduced by the trs amount thus saving you a slight bit of interest.
where as, with you they just lodge the money into your bank account when you make a payment to the mortgage, so it has no effect on the mortgage until you pay your monthly repayment.
but i doubt they think like that, they are a bank, they are not in it for the money.