Are you trying to claim it right after you log in?
After logging in, the page automatically refreshes to the home page,
instead of giving you some message about logging in successfully.
It's always done this, and I can only imagine you have to click it twice
because by the time you click it the first time, the page is already
concerned with reloading, and you can't tell it to do otherwise.
Happens to me too [ Chrome ] . You just have to be patient and let it reload first.