zte citrine cache will not fully erase

[AC Question]

I empty my cache daily regardless of how little I use my ZTE Cirtrine but for what ever reason, most of all the apps that I try to clear, only go to 12.00kb, and the other phone that I've had zero out cache.. Im lost on why..no, I do nothing with data, as I am afraid of messing up phone and not being able to fix it..
Thanks! Norma