This dark grey color worries me. Seems like contaminated and poisonous now? Why it’s growing only on one side

hi, fellow growers, first timer here. this dark grey color worries me. seems like contaminated and poisonous now? and why it’s growing only on one side. Shroomok comment: Hi, they are not contaminated. Looks weird cause it's growkit and had problems with fruiting conditions. I see aborts and mutated shrooms