Freeform drag and drop: cursor changes but text won't drag

I copied another drag and drop slide I made that works and turned it into this. Sorry, the spacing is weird because I copied into a different sized slide, but the problem is still there:

I was hoping for each statement to appear in the white box one at a time and the learner drags them to sort. In preview, the cursor changes to hand when it hovers over the statements, but I can't drag them.