theme is mysteriously injecting lines

I am using the underscores starter theme and I am trying to use the juicebox photo gallery plugin.

Here is the post on juicebox’s forum, they seemed to find some symptoms but it is not their specialty to diagnose the problem.
https://juicebox.net/forum/viewtopic.php?pid=8008

In there they found that my theme is injecting 4 lines into the top of my html as well as their xml. In addition to that it seems to be putting it in the gallery ID.

I created a fresh underscores theme and uploaded that and the gallery worked, which tells me it is something I did to the theme. Worst case I can move over everything piece by piece but this is not preferred.

My underscores theme was created last December and the repository for my theme can be found here:
https://github.com/shellwe/Great-Plains-Landscaping-WP/

and the site can be found here:
https://github.com/shellwe/Great-Plains-Landscaping-WP/

There are many more questions about wordpress I will post later this week but getting this to work is priority.

The only plugins I have active is one called duplicator (I use it for back ups, not sure if it is good, need to find one that automates backups) and the wp-juicebox (which is the gallery I am trying to get to work).