Don't spot any outlines on either image though the one at the left has a white line at the top. What effect is added?
The images in your link don't fill a 16:9 frame, which leaves black borders top and bottom...

If the CROP TO ASPECT RATIO effect is applied it will look like this...

That effect may not be available in 7.51, which is very old, so some manual cropping or sizing may suffice.
Check out the latest for the A/R effect, and see if the issue persists.