Well, if you asked EDSM API for the system, you'll get the value that Buddy displays:
Body 4 has "valueMax":1041857
To be honest, I don't know how EDSM calculates this. However I am planning to rewrite the value thing and do my own calculations based on
which I guess EDD and other are using as well.Exploration value formulae
UPDATE Sep 2022 Since 3.3, payouts have been tweaked. For stars, broadly speaking, the basic calculation remains: (k + (m * k / 66.25)) Where k is: k Star 1200 NS/BH 22628 WD 14057 The main star also gets a bonus for honking based of the value of all the other bodies in the...forums.frontier.co.uk
Interesting. Well, certainly no foul on your part. It's just bizarre the number of different values that can be displayed for the same body.