After I enter wrong username or password I can not login on the first time. When I get the "Sorry, unrecognized username or password." I enter correct log-in info and it doesn't login. It just takes me to login page again without any error. On the 2nd try I am able login without any problem. This happens everytime, I assume that you can duplicate the issue.
I just tested it on your demo
We cannot reproduce this bug
We cannot reproduce this bug on our demo site.
Which browser are you using ?
Do you have the possibility to test on another computer?
I tried with chrome, firefox