Absurd high altitude positions being recorded and transmitted to gnd

[MedadRufus]

There are 16000m+ positions transmitted and recorded, while testing on the ground

[MedadRufus]

Happens only in a GPS denied area(indoors). Not critical because it does not happen out doors. It is a mystery why it happens, even though I check if it has 5+ satellites, 3D fix and GPS_fix== OK.