Google the manufacturer's fine print and they'll talk about the mold as beneficial and not to worry. Unless you've been letting your soil sit wet in the dark for weeks growing white moldy hairs the yellowish mold okayStir that mold in and let it cook. If your going for a living soil you’ve got alive. That mold will not hurt anything you plant in it. Good luck.
I seem to get yellowish nodules like lichen on the surface when the soil is fresh/ new. It disappears after a few feed and watering cycles. I use a cheap noname brand of a Promix look alike but everything grows well in it.The soil hyphae is present in living soil and interacts with roots and soil nutrients. Sometimes it is different colors based on the source of starches present but most of the time it is white and looks like webbing.
You can run into a good amount of problems (lockout) that are very hard to fix by adding amendments to already amended soil but if it is working then you didn't add too much.Because I am doing a water only grow. What I have read is you want several different types of organic material as they break down differently. They are thriving in this mix this is just the new batch to report into 7 gal.