external controls wont respond after hiding slider

i've got a display page with 9 sliders on top of each other. 

Depending of which "tab" im in i show the sliders needed in that tab. 

This works great! exactly as i would like. 

But if i adjust a slider with my external control and then change "tab" (hiding the newly adjusted slide) my focus locks and wont move until i touch the newly present slider.

This is not true in the simulator, only on the physical MD4-10 display.

Robin