Rich Editor not displaying properly right after fresh install

Hi guys. The first screenshot shows what I'm seeing on Firefox instead of Rich Editor, the second screenshot is taken from Chrome. I've tried the stable 2.8.3 version from the website as well the latest dev-master from Github. There are different glitches on Firefox and Chrome. Just seeing some messed up icons and a text area underneath. Everything else is working fine. What can be the issue here?
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It looks some CSS files (and likely some JavaScript) isn’t being loaded properly.
I just copied Vanilla to a subfolder of my website and then installed it by accessing that folder from the browser. Anyways, I must say that the problem has resolved itself after installing Advanced Editor plugin. Now, even if I disable it, Rich Editor still works. But "out of the box" it was like that.