Cant add subform columns to detail report view

Cant add subform columns to detail report view

Hi I keep trying to add more than one of my subforms fields to view in a retail report

This is what is looks like when i go into it

so then i add another row, and it looks ok

but if i close this and go back to here, then its back to being like this


ive checked and make sure it says "Saved!" up in the top right, but every time i try it seems like its not working

Any help? i think its just a bug or have i over done something?

this is a subform that is coming from a lookup association, if that makes a difference