You might very possible have quite a few many different forms of outdoor fungus escalating in there. Fungus spores/tissue etcetera of unrelated species that was carried into your substrate about the moss, dirt, woodchips and many others. I'd personally go with sterilised sawdust inoculated by using a clean up https://psilocybe-baeocystis98531.blogofoto.com/61912836/psilocybe-baeocystis-an-overview