Game mode inconsistency
If you die/quit in a special game mode (Crowd, Challenge or Exploration) then hit 'g' to generate a new character, it will not generate a new character in the same mode but rather generates a new character in regular roguelike mode.
If you want to create a new character in that same mode, you have to hit 'e' to exit to main menu then choose the mode you were already playing again. Not sure if this is intended or not but someone should only have to exit to main menu if they want to switch game modes.