Filter Pane selections

[Peca]

Hello Qlik community,

I have a problem with filter pane, field in filter pane is fieldD, expression: 

=Aggr(Max({$<[fieldA]={'$(=GetFieldSelections([fieldA]))'},
[fieldB]={'$(=GetFieldSelections([fieldB]))'}>}"$(=minstring([fieldC]))"),[fieldD])

the result of this formula is one displayed value in filter pane, but when i select it, ten different values are selected instead of the one I selected.

When i use this formula for action in button, it wokrs as it should, selects only one value.