Did you lose ninjas while completing survival?Maybe is related.This week i dont sweep anyway,they say survival event dont work with sweeps

Details:

a) During the event, according to the conditions for the completion of each mission, pass checkpoints in Survival Trial to get generous rewards.

b) The first 4 missions will be reset daily while the last 3 missions can only be claimed once during the event.

c) To ensure that you are capable of claiming all rewards, please select a total of 12 units for your Lineup while participating in the Survival Trial Mission event. Please clear the Survival Trial manually, sweep is not count.