It's not uncommon because of the way ebay transactions show on c.c. statements. It's difficult to tell what the charge is for when it looks like this so buyers may forget or just not realize what it is they're being charged for:
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This is an easy win for sellers and if you need to respond to the case do so. (That usually involves pasting the tracking number.) Although they send you notice of the claim, ebay generally handles it internally and closes the case in the seller's favor.
Does the notification say that you don't need to do anything?
This should give you peace of mind.
If a buyer files a payment dispute, the seller may be eligible for payment dispute seller protection.
www.ebay.com
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