phonegap iOS: kml and csv layers doesn't load on mapbox

i'm working on my first app with mapbox and Ionic

and on the site it's working great

it's responsive and on modern phone it works great in the browser app

however when I run the app in phonegap (or ionic) on ios (emulate or on device) it doesn't load any kml and csv layer

the rest works good

on android everything is ok

but no layer on ios app

any suggestion?

thanks a lot

Jacopo