SSRS page break not working

I have a main report calling three subreports, and grouping them all by course. I need the first two to show up on the same page and then have the third report on the next page. It should then break to a new page again and start over with the next course. I checked the box in the 2nd report tablix settings for add a page break after. As seen in image 1, it did not work as expected. So, I also put the 2nd subreport into a rectangle and checked the page break box & the keep contents together box in rectangle settings. Nothing changed.
I did the same settings with the 3rd report.
Is there another setting I need to change?