The GPL has been updated in the current beta and not all of the articles have been adjusted to reflect the new changes. The Planetary Average option of the GPL will only allow the selection of two planets. The article has been updated now to reflect this.
I’ve replicated the Price Unit issue reverting to 5 now and have logged it with our developers for review.
I removed the ability to add more planets for the time being because on review the calculations are not correct. The issue is that averaging multiple angles is very tricky, it is not just add them up and divide by n.
Two planets is fine, but adding more is a real problem as the average jumps when one of them passes 360 degrees.
On further research I have found that using vector math is a more reliable way to do this. Imagine 3 angles as vectors and join them nose to tail. Then draw a final vector from the start of the first to the end of the third. The angle of that final vector is the correct average angle.
That’s easy to draw, but a bit harder to code. Fixing this is waiting for me to get time to look at this. In the meantime I have turned off adding more than 2 planets.