Display for rest of project displays on top of everything else

I'm using a really cool gif for my project background. To have it loop seamlessly I've set it up on the first slide to display for the rest of the project. However when I go the next slide, it is displayed on top, hiding everything else. I can't re arrange it in the subsequent slides, as it only shows on the first slide's timeline, which makes sense.

Now in the properties for this gif, it shows a greyed out check box labeled place on top. I'm not sure why this is there since that's the only place the "option" exists. And interestingly it is not placed on top on that particular slide.

Is there some way to fix this without messing up the seamless looping of the gif? Any way to re-order the slide layers in advanced actions?

Thanks for any help!