I’ve never played with the SO Pick List… but I would try looking at the Groups at the bottom. Find the Group you want to work with and go into the Group Properties and “Page Breaks”. There’s an option there to add a Page Break “between each instance of a group.”
I have spent an embarrassing number of hours trying to get reports to format just right across page breaks. It seems there is no one way that fixes everything. There are so many controls that might affect it. But it’s just like Epicor. There’s a hierarchy at work there. I’d start with your Keep Together setting and make sure it’s set to true. You have it on your group as well as your individual controls on the report. There may be a rectangle, your tablix row, as well as the text boxes themselves. I’d play setting Keep Together true on different combinations there.