Not tracking Android/IOS browsers

I installed Piwik 2.12.1 to monitor 2 of our sites.
It tracks everything exept android/IOS browsers.

Hi there,

Piwik should track android devices correctly. do you have some more information? also see: Piwik doesn't track any visits and pages, and shows "There is no data for this report" in all reports. - Analytics Platform - Matomo