Bootstrap styles not showing up in Production Server of Spark-ed App

Redid my app with Spark - worked great and looks great local. When I push up to server (Forge) - everything works except for some reason the Bootstrap styles aren't there -

My public/css/app.css is a mixture of tailwind and Bootstrap and I can actually see the styles from Tailwind working their way into the final product - but for some reason, the Bootstrap style--in the same exact file--just don't register.

Any ideas? I've been looking everywhere for an answer...