Welcome to the forum Laker,
What filter are you applying to your summary? You can check that on the General tab of the Summary Definitions tab. Make sure the "Apply Filter" is set to "Default Filter" or else your summary will always use that filter you have assigned. The "Default Filter" setting will always use whatever filter you have applied to the table.
Whenever I need to apply multiple filters to summaries thru script, I always make sure that I have the default filter set in the summary or I will have multiple summaries set to apply a certain filter for that summary that I need.
Hope this helps.