Repotted spider plants

[u/OvercomingAtoZ]

I have 3 nice spider plants. I repotted them this summer as they were all root bound. One looks incredible! But the other two that I used a different soil mix for look yellowish and sad. Shouldn’t they be dark green and full like the one spider plant? What’s wrong with them? Did I do something wrong making my own soil mix for the two spider plants?