I got the QI 10,000 gold reward for Skull Caverns twice?

[Wisp]

As P2 in co-op I got to floor 25 in Skull Caverns before P1 did. We closed the game, next day played again, I went in the normal mines and the next day I got the same mail awarding me 10,000 gold. I haven't gotten any mail about the next part of the questline yet. What happened?

[*****123]

You don't recieve another mail after you get to floor 25 in the Skull Caverns apart from the 10,000 gold one. You need to do something after you get to floor 25 then you will recieve another mail.