Go to next/previous in global list item does not function

I have made a global switch, type list, an addes "0,7,14,21,28" for my events. I have a stack group with the next seven events. Then I want to show the next 7 events by touch of a button. Therefore I use the touch function, gobal switch, my list (calles events), and then I see the list an next an previous item. But this is confused and shows "7 next 0 21 14 previous 28" And therefore the next and previous does not function. If I make two buttons, and the first one going to 7 (first in List) next an previous do function. It woud be great to be fixed or give me a sign, what I do wrong.