There are several ways you could leak plain dns. WebRTC requests, which I know ipleak checks, port 53 traffic not being sent through the vpn. There should be a config file that you can modify to help send your dns requests the way you want. This is not uncommon of a problem and you should be able to find a relatively easy solution to this quickly.

After a quick search: Izatcloud is qualcomm extended satellite positioning, which may be a different version of GPS. But not entirely sure, here is a privacy related article about it. https://restoreprivacy.com/qualcomm-denies-unlawful-user-location-data-collection-on-phones/