basic 3D, bug?

Many times I use basic 3D to adjust a video slightly, in the past it all went well. Now I export the videos to after effects, but it must be fixable in premiere?! This is what happens: I put the basic 3d effect on a video. There appear two black bars on the right and left side. When scrolling over the video the sides appear again. Worst thing is the black bars are there in the render as well.. Hope someone has a fix!! (video included)