Odd gaps in Running Sum Line Charts

Hi all,

Tess newbie here! I'm trying to create some line charts that compare this vs. last year's running sum of admissions for three categories: our Galleries, our Films, and both together as Total Admissions.

The Galleries and Film charts look fine, but for some reason when I generate the same chart for Total Admissions, there is a gap in the line between fiscal weeks 26 and 29. It only appears once I've included the season filter 2023-24 Film Series.

I've tried adding "TRUE" to the formula as suggested in previous forum posts with this issue, but it doesn't change the line. Does anyone have any ideas why this gap might be occurring?

Thank you!