My aju birku changed sprite after it said it got primed. It might have happened before that but I didnt notice til then. It show his sprite in combat and in the map in the menu but in the menu and on the world map his sprite is that insect.
Same happens here - happened more than once too. Interestingly, it also happened with my own Aja Birku and it also changed to a Waspid sprite. It usually goes away after a bit though.