USPS raised fees on a lot of their stuff at the start of the month. I'd check thee first. Sometimes, eBay shipping is weird. I've had a few cases where I could ship via Priority Mail (Not in a Flat Rate Box) for less than Parcel Post. Lat week, an item I was shipping had 49% off Priority Mail, but only 23% off of Parcel Post. The buyer received free expedited shipping in that one.
I'd see if your discount amount has changed, and then check the USPS fee changes
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