Maybe it didn't follow the standard pattern of 10s and 11s? Those adjustments don't match the ones in FRCS.

According to FRCS:

Air: +2 Dex, +2 Int, -2 Wis, -2 Cha
Earth: +2 Str, +2 Con, -2 Wis, -2 Cha
Fire: +2 Int, -2 Cha
Water: +2 Con, -2 Cha