white fuzzy mold

[mofms1]

I have a Paph Supersilk Eureka and Paph Spring Desire. I just got these a few weeks ago at an orchid show and they're the first paphs I've owned. The Eureka bloomed a week or two after I got it, but the Spring Desire was already in bloom. I ended up cutting off the flower spike for the Spring Desire because there was a large brown spot on the top petal (I'm not sure if my terminology is correct). There was also a brown spot about halfway up the spike and on the lower leaves. They were brown and wet enough to tear off easily, but the other leaves seem fine. I was scared they were rotting.

I then repotted it (I thought the medium was too wet and that's why all the brown) in bark medium in a terra cotta pot. Today I realized there was fuzzy white mold forming on the sides the terra cotta pot so I took the paph out and noticed the mold was also on the top of the roots. So I repotted again into a plastic orchid pot with all sorts of holes on the sides, in new bark medium.

I don't know what I'm doing wrong. Obviously I'm watering too much, but I was told the roots like steady moisture and there was never standing water in the pot. I do have the Spring Desire in a plastic indoor/outdoor greenhouse, but nothing else in there is moldy. Is it just not getting enough airflow? Do I need to give it more time between watering? Should I not be freaking out over the fuzzy white mold? I've taken care of phals for a few years now and never had problems like this.