Game Mechanics: Alchemy Skilldown from GM training

[Zombozo]

As an Ogre Shaman I trained alchemy when I hit 25. It trained me to 25 skill. I'm now 26 and attempted my first potion, and when I combined it I received the message of "You have gotten better at Alchemy (10)." I thought, this may have been just a way for them to set the skill back the way it was in classic (never played a shaman that long ago) and that it was only supposed to start at skill level 9 or 10. Going back to the GM shaman, I train the skill back up to 21, where I can't increase it anymore from the guildmaster. I attempt another potion, it fails. I attempt another, and get the message "You have gotten better at Alchemy (10)." I look at the trainer and my skill points are still gone from training the skill up.