After we investigate the issue, we tested also with several wordpress version and this only happend with the latest wordpress 4.4.1. This is the wordpress core bug, please refer to this: https://core.trac.wordpress.org/ticket/35344
To resolve this you may need to revert to WP 4.4 or wait for the official update from wordpress. I asure you this is NOT a THEME ISSUE. This WP bug will affect all themes that utilize homepage template as their front page.