This just means that when TurboTax compares the overall data in your return that item is different from others. I would imagine that could be for any number of reasons including perhaps a fair number of individuals who report income from this type of work who don't do it full-time and, therefore, don't have that expense.
It's just pointing something out it wants you to notice - but there is nothing to worry about in your case since you know the entry is correct for your business.
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