Hello! I’ve had this same issue occasionally. There are a few things that would cause this lack of updating. In order of likeliness, they are:
Browser Cache
Host Cache (GoDaddy has a cache flush option now!)
CSS Cascade Order
Plugin Cascade Order
Since you’ve tried your browser cache, you should focus on figuring out how to update your host cache. You would know it was this error if you edited your CSS, and found that it applies hours later. If so, ask your host how to flush your database cache.
If that doesn’t work, what I’ve found is that some of the professionally-made themes force their custom CSS areas to override all other cascades. Some designer plugins (Visual Composer is bad with this sometimes) will also do the same. Apply the CSS, then use Chrome’s web developer tool (right-click => inspect) to see if the code appears somewhere with a line through it.
If you’re applying CSS and the editor isn’t saving your changes then your best option is to edit them offline and use SFTP (FileZilla works wonders) to simply replace the files you’re needing!