Hi @Seller_z0yu129sVnKKP,

According to the carrier shipping correction charges help page (link), these adjustments can happen for both original shipments and returns when there's a difference between the package measurements.

Each carrier calculates these charges differently. Under the "How correction charges are calculated?" section, it explains that USPS uses actual weight, while UPS uses what they call "billable weight" (whichever is greater between actual weight and dimensional weight).

If you'd like to check the specific reason for an adjustment, you can:

1. Go to Transaction View on your Payments page
2. Enter your transaction order ID
3. Look for the "Carrier Adjustment" line item
4. Click the amount in the "Total" column

This will show you both your provided measurements and what the carrier measured, along with their reason for the adjustment.

One thing worth noting - these are actually carrier charges that Amazon passes through, not Amazon fees themselves. You can find this mentioned in the help page's note: "None of these charges come from Amazon. They are charges from the carriers that Amazon is referencing to you."

Hope this helps clarify what's happening with those adjustment charges!