Why gallery app is opening when i click some other random app like WhatsApp in honor 6X?

[Android Central Question]

I opened gallery and closed it after using it. I used apps like WhatsApp and played some games. I killed all the apps before locking my phone. After that I unlocked and clicked WhatsApp gallery is opening and shows the last image I was seeing before killing gallery. This happens many times. But can't understand under what specific situation this is happening.

 

[B. Diddy]

Welcome to Android Central! Try wiping the cache partition: HONOR 6X - Recovery Mode - HardReset.info