Leech/Leach
 

I have the spell Leach memorized in my spell book, a level 12 duration lifetap. I went to east freeport to buy my new lvl 16 spells, and saw Leech spell, same effects for sale. So it appears you have Leach and Leech in game. I remember Leach being the classic spell, either way you have the same spell under two different names.

There's only one spell.

The scroll was spelled differently than book icon.

Fixed.