I normally find there are plenty of green and yellow bananas. Grab a few of each and just eat them in slightly non-optimal ripeness. I don’t think you can really gauge a bananas ripeness down to the day anyway.
I wonder if they might actually be combining them from different deliveries. IE, they grab an average ripeness one from the Monday delivery, an average ripeness one from the Tuesday delivery etc and by the time the last delivery is added the first one is about ready to eat.