A fix has been implemented on the Download page for browsers that don't copy the HTML templates correctly, which was resulting in the templates being pasted in to the GTAForums editor with incorrect colors. For example:
Some browsers, such as Chrome and other Chromium-based browsers, alter copied HTML to inject formatting inheritted from the page it was copied from, even thought that formatting isn't defined in the copied HTML directly. In the example above, the orange link color from this site's links and the white background and dark text from the default light theme.
So now when copying anything from the HTML templates on the download page, either manually or with the copy button, the site will automatically re-alter the copied HTML back to what it's supposed to be so that it pastes correctly in to the GTAForums editor.