Paphiopedilum with brown pits on leaves

[paphnoob]

About a week ago i purchased my first paphiopedilum. Up until this, i had only taken care of oncidium and phalenopsis type orchids.

A day after i got it, i repotted it in a mix of moss and fine grade bark. It is in a clay pot with ventilation holes. I also cleared away the dead roots when i repotted it; it has 3 live roots left. I have it near a SW facing window; it isn't exposed to direct light. I watered it with pure water and a small amount of liquid fertilizer for orchids.

Yesterday, i noticed brown spots on the tips of one leaf. It didn't have these when i got it.

Has anyone had any experience with pitted brown spots on mottled paphiopedilum leaves?

Any advice is appreciated!