Filtering not working

I’m using the filtering options, but they have stopped returning any results. Whether I try a substring or a complete copy of an existing field, I never get any results. Works fine before filtering. The browser debug is not showing any errors. Any ideas?

Screenshots here: https://theprogrm.com/wp-content/uploads/Screenshot-from-2017-09-09-09-19-16.png
and here: https://theprogrm.com/wp-content/uploads/Screenshot-from-2017-09-09-09-13-43.png