Pinboard Customized Template Problem

I am having a major layout issue. I am developing a site locally for deployment on a hosted server soon. I need to customize some of the templates so they will only show posts from a particular category. I have already figured out how to make that work and it is working beautifully as expected. However, when I customize the template, I lose all of the javascript functionality including the layout “grid” and the infinite scrolling.

I have an inkling that there is a “master” JS file somewhere that actually lists out the template names because if I customize a template and only change the name up at the top, I lose all layout. The CSS applies correctly, just the way the posts layout on the screen is wonky.

If there is someone who could help me get this resolved, I would be ever so grateful. I am guessing it is a simple fix. I just have no idea where to start.

Thank you in advance for any help!