Brown spots on Paph leaves

[ces797]

Hi Guys
New to the paph world. I have one a Callosum/Ruby Leopard cross and it's currently in spike. My question is that two of the leaves have developed brown spots. They almost look like rust and they do not penetrate through the entire leaf. It's in an east window with all of my phals and receives dappled early morning light and indirect the rest of the day. Is this a sign of too much water? It's in a mix of coco I'm assume which seems rather dense and is quite foreign to me as I'm used to bark. Any help would be appreciated.

Thanks!
Curtis