They're probably just fine but if you're worried at all (and I think you are), you can add 1 tsp of hydrogen peroxide to a gallon of water and use it to water your plants when next you water/feed. The hydrogen peroxide will kill any mold spores in the soil and not only NOT hurt your plant, it will protect the root system at the same time... I'd also wipe the chopsticks with that solution to kill the mold there if you want to use them again. Anytime you have an issue with mold, this is a go-to problem solver.
Good luck and Happy 420!