I believe there's a virus of sorts which will change URLs written in emails and online. I know it's caused problems on other websites (A kingsnake ad that had the URLs for the photographs changed and a signature link on Fauna) and led to some embarassment for the person who posted such (through no fault of their own).
Test for it... Email yourself a couple dozen times with a website URL or hyperlink, see if it gets changed at any point. Similarly create a number of website posts and watch for changing URLs. Then, in all likelyhood, get yourself a good anti-virus program.
"Genes, Like Leibnitz's monads, have no windows; the higher properties of life are emergent... And once assembled, organisms have no windows." - Edward Wilson, Sociobiology