Matrix visual unable to sort

[jostnachs]

Hi All.... I have a requirement where i have a matrix visual and fields are as follows. but the user logs an issue asking me that he is unable to sort by clientname. When I tried am surprised to see the same, I am unable to sort with clientname i.e. even when i click on the arrow, The list doesnt change. any thoughts on this. how can i get that done. 

[lbendlin]

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