Mobile Home not following Language settings

We have an international site with 3 languages (EN, ES, ZH), and special mobile home pages for each, linked via the PolyLang plugin.

Previously, WPTouch would detect the user’s language and redirect to the correct page. Now, it defaults to English. The language setting in WPTouch is set to “Detect Browser”.

Is there something that changed? Or a setting I’m not seeing?