Media Queries Broke After Saving the Website

While working on a project for my Adobe Digital Design class I ran into the issue of my media queries that I made. The assignment only calls for two media queries for mobile and tablet devices. Yesterday I was able to successfully set up and activate the media queries, and at the end of the class period when I went to save my work I did everything normally. Save All > Root Folder. Now today my queries won't work and it's stuck in the mobile preview. My previous CSS Styles didn't save for tablet and desktop devices. I tried YouTube and Google, but most if not all the websites were for Dreamweaver CC 15, 17, 18. I'm using CC 18, 19, 20. I'm also using a site template, but that shouldn't affect the media query styling right? The media queries were set up on an external style sheet. They simply won't update and I'm getting stressed because I don't want to reset my entire project.