From iRO Wiki

Int bug - fixed

For the record, the INT bug with this skill seems fixed on iRO now. Apparently, jRO got this fix a few weeks ago:

"2008/03/04 patch fixed dragonology, so only level 5 gives INT + 3"

Seems we got it as a submarine update! --Bluedreams17:59, 26 March 2008 (MDT)