Still here today (or back again). Scroll to the bottom of the generated source on the forum home page.
I wonder if it might be something in your computer that is affecting generated source. A virus or installed program that does something you're not expecting?
On the forum home page generated source, I find no ".rr" anywhere on the page. The only script on the page is the privmsg one at the top. At the bottom all I show is: the phpBB copyright division with their notice and link, the closing "bodyline" cell tag, the related closing row tag, the related closing table tag, the closing body tag and the closing html tag.
(On this topic page there are additional scripts for sending private messages, but no others.)