Hi Ichi
as far as I can see, the problem should be fixed by plug in developer as well as the theme developer. I have made at that time, the bug existed, a child theme and modified the header.php by using the recommended code snippet. (replaced bloginfo(‘url’); by esc_url( home_url( ‘/’ ) );)
If you don’t have the latest version either of both theme and plug in, try this first.
regards, Paul