Redash results missing some rows from underlying SQL query

When I run a Redash report from our Asp.NET web app I am missing some rows despite all the filters at their default settings, but when I set a breakpoint on the code that generates the query, copy the query into SSMS and execute it, I get the results I was expecting. I’m very new to Redash. Any suggestions on where I should be looking to figure out where I’m losing rows between the raw query and the rendered report? Thanks.