What would be your preferred/expected result in this case?
The program indeed creates songs that land on the 1, and in G Lydian that becomes G (major) which I agree does not always create the best results as the 1 is unstable in Lydian.
It basically uses G major scale with an augmented/sharp 4th.
To improve I guess it could be an idea to focus the chord progression on the 1, 2, 7 then use the 3, #4, 5 a lot in the melody and resolve the progression on the 5.