Slides not using assigned breakpoints

I'm very new to Captivate, so please bear with me. I have watched several tutorial videos, and have been doing some reading about Captivate, but I'm still having trouble. I'm currently working on creating a responsive course with three separate modules. I have my roughs uploaded to our LMS, and while they kind of work, the breakpoints I have set seem to have gone out the window. I was under the impression that if a viewport was in the size parameters of breakpoint A, that it would use the layout of breakpoint A; or if it was in the size that corresponds with breakpoint B, that it would use the layout for breakpoint B and so on. However, when viewed on certain screens, the layout seems to completely break and things move all over the place. What do I have to do to ensure the integrity of my layouts? I have looked through the forums to try and find this particular problem, but I haven't found it, so if this is already somewhere with an answer, I apologize and would love to be pointed in the right direction.

Thank you!