Looking at missions in Dumont Haulage, sorting them by payment (not my usual sorting), I find that they are sorted on the first digits, NOT on the total amount, so it goes:
Kale Savage Phoenix15 37 999 cr (+6 %)
Anchor Shepard Phoenix15 37 999 cr (+6 %)
Gideon Outpost Terranor Phoenix16 34 979 cr (+6 %)
Pressman Station Zeonis Phoenix17 32 979 cr (+6 %)
Geda Nebraska Phoenix19 28 958 cr (+6 %)
…
Arlington Dock Arlington Phoenix10 15 270 cr (+6 %)
Chimera Oceania Phoenix 7 20 252 cr (+6 %)
Kale Savage Phoenix 20 37 1,332 cr (+6 %)
Kale Savage Phoenix 18 37 1,199 cr (+6 %)
…