This was a weird compositing issue. When I comped my sphere onto the background, I was met with this weird ghosting effect. For this set up, I used AOV's instead of using render layers like in the last project. The only AOV's for the sphere are the diffuse direct and indirect, and specular direct and indirect.
Turn out, that this is a weird alpha issue. The way around to fix it, is by using Nuke's Copy alpha node. I plugged 'A' into the imported file because it has the proper alpha. I plug 'B' into the last node after all the layers have been merged. I finally continue compositing the rest of the layers after that node.