Accessibility: Tab Order Showing All Buttons as One Object

I'm running into an issue setting my tab order so that the slides make sense when read by screen readers. I have slides with a question and between 2 and 4 radio buttons showing possible answers, which I built myself instead of using the pre-built survey or quiz questions. The button set for each button is marked as "none," so none of the buttons are part of a set. Yet when I go to set my tabbing order, the buttons all appear as one object within the tab order window. They are highlighted separately when I preview the slide, which is good. But I have feedback boxes that pop up in response to a user clicking on a button, saying correct or incorrect and why, and because the buttons are all appearing as one object, I can't move the feedback boxes between the different buttons in the tabbing order. So that means that a screen reader reads all of the buttons before reading the feedback text, which I think would be very confusing for users. 

I know I can set the feedback layers to hide objects on the base layer, but I've found my slides look kind of weird without the base layer objects there so I'd rather not do that. Any thoughts on how to make the buttons appear as separate objects in the tabbing order window?