I somehow have a number of sections which are marked as "keep on same line as previous" as indicated by two dots in the structure icon.
This is having an adverse effect on PDF production
No amount of "jiggling around" the component by dragging and dropping will remove these dots.
I believe you have used a non production version of Maestro. This does not occur on Maestro 5.1.1 nor will it once 5.1.2 is released.
Right now, you can't.
But you can add empty blocks, and then add your "same-lined" components to those blocks as children. This solves the issue.