fungus in media

[OhioBob]

I repotted several plants recently. Two of the orchids had fungal hyphae growing in the media. The dendrobium was in a rock/bark mixture and the mold was in chunks like it decided to grow on one piece of bark instead of spreading. The oncidium was in a bark only mixture and the mold was throughout the mixture. On both plants I had really good looking root systems with no dead roots.

Is this a normal situation and should I be concerned about the transplants? The onc went into SH and the dend went back into a rock/bark mix.