Ben's First Mission

How on the earth enemy Don Penguini is hitting my Pengborg while I have 3 other auto protect rockoids in the field? Can you explain me please? He did this twice and killed my Pengborg ! Same thing happened by other monsters of enemy too. They attacked my another monster while there was an auto protect rockoid in my team on the field.

Auto Protect only has a 60% chance of blocking, making it slightly unreliable. Aegisdragon is an exception since he has auto protect plus, which is guaranteed. 

Oh my god, thank you for your reply.