Premiere Elements 11, 12, or 13 on Windows 7, 8, or 8.1 64 bit....
You could go back to the project and, in the Edit area, scale out the bouncing bottom edge. I am assuming that it will be visible there.
Then do another burn to folder, and then take the saved folder's VIDEO_TS to DVD disc with your 3rd party software, presumed ImgBurn.
If you want to scale width and height together, then leave the check mark next to Constrain Proportions in Applied Effects Tab/Applied Effects Palette/Motion Panel expanded. If you want to scale width and height separately, the remove the check mark next to Constrain Proportions in Motion Panel expanded.
Please let us know the results. We might consider the Crop Effect also. (fx Effects/Transform/Crop with edits of it int Applied Effects Tab/Applied Effects Palette/Crop Panel expanded).