That one looks simple enough.

There's several enhancements in Harper that don't follow the normal level limit for enhancements.

Harper Leadership is a T2 enhancement that requires you to be level 3, while Strategic Combat 2 is a T3 that requires you to be level 2.

Further up, Throat Dagger requires 20 points spent in the tree, but as a T4, I don't think it should be unlocked at level 1.