Bullet proof vest, mutation jacket and AK ammos problem

I currently have 30 days of bullet proof jacket, a helmet and a 90 days of mutation jacket. The weird thing is when I wear all of these items, they will always cancel each other out. For example, if I wear bullet proof vest and helmet first, and I activate mutation jacket after, the effect of the bullet proof set will get canceled, vice versa. I tried many ways to solve this problem but end up no where.

There's also another issue. I have both AK silver and AK gold. With rifle magazine and mutation magazine, golden AK only provides 38/228 ammo whereas silver AK provides 35/210 ammo. My friends have silver AK but with rifle and mutation magazine, they are able to get 35/280 ammo. I am not sure what's the problem here, so HELP! btw, I am using the SPOP character.

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