Here I am using a List based parameter and Filter_question_type fields is present inside my dashboard. When I select all items inside my parameter, the output goes to 0 while if I select n-1 items it works file.
Note: n denotes all possible values of parameter
I reproduced the same behaviour, which I can’t explain yet, but I managed to get the desired behaviour if I hide the “Select All” option in the parameter control (Format control->Control Options).
Let me know if this helps and provides a solution.
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