Theme: Catch Fullscreen

Hello, There is a problem with the specific theme: catch fullscreen. The login popup window pops up when the homepage is loaded, the email is put in, but I can not use "Tab" to focus the next input "password". The other page (any document page) works, only homepage has the issue. While If I change a theme, the homepage works. The "cath fullscreen" is quite good and meet our requirements very well, could you please check and help thanks.