Thanks for reporting,
There must be something going on at Bitly that is causing these false security warnings.
I'm not sure creating new links would solve this, or for how long.
The best thing to do for now is if you (and other forum members that care and have a moment to spare) could fill in the form that the warning page has a link to, to inform Bitly that the security blocking is a false one.
I am guessing the more users report it, the sooner it will be solved.