White vertical line on sides of LineTest

Every video I export after making a line test in Pencil Check Pro seems to cause this vertical line on both sides of the video.

No matter what I try I find these end up staying. :frowning:

An example is my most recent post here. (watch the video)


Any tips on removing them?

Does your image fill the output resolution you are using?
Please post further Pencil Check Pro inquiries in corresponding forum.