That is usually from the shoe being left unworn for a long time and the rubber degrades. Could have happened before or after you bought them. A full sole replacement would be needed to fix this unfortunately. Some sneakers have the same issue when stored and not worn for a long time.
I bought them new and wore them in the operating room 5 days a week for a year and the heel was fucked. Maybe they sat too long on the shelf, you're probably right
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