Stat Point Allocation

[bio_hazard]

I'm guessing this is by design- I just leveled up in the Arena- Level 18 Higher Human Archmage (Wave 25 if it matters)... I'd noticed on a few previous level ups that some stats (strength, constitution) indicated 0 improvement in abilities an attributes if I put a point in. Willpower and Magic still showed increases in spellpower, mana, etc... Now on level 18, it doesn't appear that allocating my 3 stat points will do anything! I'm at:

S/D/Con/M/W/Cun 13/11/20/45/34/11

Are there hard limits on stats? What's going on here?

nvm- I could have sworn the mouse-over showed you a preview of what adding a point would do, but apparently you have to add the point and then see what it does...