Follow button in mobile browser not actually do "follow"


Hi. I placed Twitter Follow button in a splash page for my Wifi network. Recently, when seeing in mobile browser, clicking “Follow” doesn’t let me follow target person (the button becomes grey, but later when I check again, I’m still not following). Other than that, under Android and iPhone, clicking button pop up a page and not trigger the event that I want to bind with click.

Please tell me how to fix it.