Hi Ashley, the starter during the creation process is more susceptible to mold because it hasn't yet developed the natural defense mechanisms of a fully mature starter. If starter residue remains on the sides of the container, mold can sometimes grow there as well. This is more likely to occur in warmer, humid environments, but it can happen anywhere. As long as the mold hasn't entered the starter, you could remove a small portion of healthy starter from the bottom of the container to continue feeding, and clean your crock well with hot, soapy water (rinsing completely). Allow the crock to air dry before using it again. Stirring the starter thoroughly during the early days of starter development, especially when you're only feeding once a day, can also help prevent mold from taking hold in your starter. 

If the other brand of all-purpose flour that you're using happens to be bleached flour, I would recommend switching to an unbleached flour. 

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