All Drop downs showing same value.

I have 3 drop downs bind to the same service whose output is list of mashups in the project.

When i try to change the value of drop down 1 then the value in the other 2 drop downs automatically change to the same value. 

I need all the 3 drop downs to show values that user has selected.

I don't understand how the 3 mashups are connected.

Also is there a good way to default the previously selected values when the mashup is loaded.