Thank you so much for the detailed explanation <33
I checked the data, and looks like you got a very rare issue, where you killed the boss but then either you quit the game extremely fast, or your internet connection was a lil slow to send the data back, or just a connection issue happened.
Which lead to increasing the wave variable to an unexpected number (10), which when you kill the boss it should auto reset to 0.
I fixed the data manually, hopefully you can play normally now <3