Using multiple image target tracking

 Using multiple image target tracking  (3 image targets) ,  when i make it in Vuforia config to show 3 tracking simultiniuos it works fine and showing the 3 models on the 3 image targets

BUT, when i just want to show 1 target Max only .. I changed it in the Vuforia config to MAX 1  ,  But it only shows 1 model on the first image target only ,but not showing the rest models for the rest image targets on my Android phone ..

It works well on Unity on my PC , but not on my phone :(

And it works well on phone when i turn it in Vuforia config to show the 3 simultinious!!!!