Do you have any physical device to make the test? or ask some friend with an older version.
The mobile emulators are never the same thing as a real device in my opinion.
Maybe this is related with an recent problem between the Chrome version and WordPress.
Try this plugin that was developed by an author in Themeforest, until chrome or WordPress don’t release and update for it.
AND it broke my backend access. frontend everything was ok, but as soon as i installed it i couldn’t access my backend anymore (tried installation through wordpress and manually with ftp)