Paphiopedilum delenatii – repotting deflasked seedlings

Deflasked these Paphiopedilum delenatii seedlings just last April, but had to re-pot so soon because there was some white webby mold growing on the top of bark. I didn’t find any insects and it didn’t seem to affect seedlings, probably just kept them too wet.
Anybody knows what it is?

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