iPhone 6s, iOS 11.4.1, Feeld v 5.0.1

I matched with a young woman not very long after updating to Feeld 5.0.1. I sent her a few messages, but the receipts don't make sense. The app says my messages were delivered/are queued for delivery not in the order in which I sent them, which makes me wonder if the one that says "delivered" was delivered at all. The fact that I've not heard anything back from my match raises my suspicions even further.