The Spell Conjure Fire Elemental [sppr605 + spwi620] summons with
60% chance: a 12 HD Fire Elemental
35% chance: a 16 HD Fire Elemental
5% chance: a 24 HD Fire Elemental
The 16 HD Fire Elemental has lower Strength (14 STR) than the 12 HD one (18 STR).
It should actually have 18 Strength just like the weaker version.
Involved CRE-files (16 HD Fire Elemental):
1) That's more a problem concerning BG2, I guess
2) Made the title more clear
3) Added correction from Wisp