Game Mechanics: Defense skill wont raise!

[Syft]

I've had players beat on me let light blue mobs beat on me, and my defense refuses to raise I'm getting rocked by melee's. One of the two skills you can't raise at trainer, it should roll off my int but no matter how high I rais it my skill stays at pre 40 lvls. Don't know what to do this point. Never had this problem on live.