I was in a party with one friend and we found two other random hunters. Upon finishing that match, both of us got a message saying “could not contact profile server” (not exact wording), we didn’t see the progression screens and got booted back to the matchmaking screen. Neither of us got our XPs or levels for winning that match. I don’t know whether the two randoms (or even the monster) also got this error.
I’m an old Evolve veteran, btw. Both of us are located in Brazil and we did finish other matches without progression problems.