Whenever I upload an updated CSS file there is a twenty minute or so delay before the update goes live. My HTML document is reading the CSS file fine and I can update the HTML, even the content stylized by CSS, just fine. I thought maybe it was a FTP file client issue or a text editing software issue but I've tried various software alternatives with the same result. My CSS file and HTML document are simple; no errors. Any ideas what could be causing this issue?