Level 82 becomes L81 (no double corruption)

It happend to me twice now, that what should have been a Lvl 82 map turned out to be a Lvl 81.

In the first Screenshot you can see that a L82 is coming up, but when i portal into the map its only 81. (the irriaded button is missing but you can see the monster lvl at 82)

Double corruption atlas passive is not active.