backend query ( filters )

I'm making a backend query with filters. ( I have two pages where my user can click on buttons that define app states and after that on a page of feed, I have a backend query that uses the app states in the filters. I use the filter " equal to" because I see that "in " can be used juste a single time. When I'm using one filter ( string "equal to " string ) and I go to test mode : there is no issue. But when I add other filters "equal to" and I go to test mode : I have a blank page. Do you know if this is because of the test mode or if I have issues with my filters ( weird because it works for a single ) .

Thanks for your time !!! have a nice day !

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