Katjati

Hi everyone Last night when sending a photo to a friend on Facebook messenger app on my phone (Huawei P8) I noticed something creepy. I accessed phone gallery through fb app and there were pictures I didn't remember taking. Some of them of me, others ceiling, noise or just black. None of them were visible in regular Gallery app. I found a folder in main internal storage directory called "photo" with over 150 suprise shots from the front camera. No create date included just modification: 30 Nov, 1 Dec, 4 Dec. Mobile Security took no action, all protections are up (except Anti-theft - I switch off data transfer and GPS when not using it). Does it take shots while the unlock pattern is incorrect? Or could Facebook be bold enough to do this without my knowledge? Am I being hacked? Does anyone know what's happening? What do I do?