Pigs are not dropping porkchops

I have MCPE 0.14.0 full version (not a beta build, but the same bug happened when I had build 7) and everything is working fine. But I have killed some pigs, that didnt give me food, and were not baby piggies. I know something wrong is happening here. Im not really sure if my device is Samsung Galaxy s5, but is a Samsung, I think it is a s5. This is all I can write up. I thank anyone that can help me.