RFC1918 leak test

Okay so I’m noticing a problem whenever I do a DNS leak test with my Android phone or Android tablets it displays my internal local IP under the RFC 1918 in the leak test.

Everything else shows proper now I do have policy based routing going on so everything else passes but this how do I prevent that from happening or is this a problem at all.

Now the workstations on my network don’t display any RFC 1918 information