Experiencing unusual USPS label price adjustments?

Shopify Discussion
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Topic summary

On July 4th around 7:30 PM, numerous Shopify merchants experienced a massive wave of fraudulent USPS shipping label adjustments, with charges ranging from hundreds to thousands of dollars. One seller reported over 30 adjustments totaling $700, while another was hit with approximately $5,000 in unexpected charges.

The Issue:

  • Adjustments cited incorrect weight/dimensions, but merchants had intentionally rounded up weights to avoid such charges
  • Many packages showed impossible weights (0.16 oz—less than an empty box)
  • Charges of $22+ appeared on First Class packages where dimensional weight doesn’t apply
  • Dimension discrepancies were fractions of an inch that wouldn’t affect pricing

Merchant Frustrations:

  • Initial support responses were unhelpful, directing sellers to contact USPS or file claims themselves
  • Shopify holds the merchant shipping account, making independent dispute filing ineffective
  • Charges processed during regular billing cycles despite the acknowledged error
  • Some merchants incurred overdraft fees and had to postpone sales/shipments
  • Support estimated 12k-50k adjustments were impacted (potentially $1.1M+ in erroneous charges)

Resolution:

  • Shopify eventually confirmed a USPS billing system error affecting July 4-5 shipments
  • Refunds/credits were promised and began rolling out
  • Merchants expressed anger over lack of transparency, delayed communication, and inadequate compensation for secondary damages (overdraft fees, lost sales)
  • No claims filing with USPS required for affected merchants
Summarized with AI on November 2. AI used: claude-sonnet-4-5-20250929.
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Were your ebay and pirateship disputes for something outrageous like a $22 charge (that all or most of us seem to have) or something reasonable that makes sense?

Even if my packages were upgraded to priority mail for some reason or were off by an ounce or two with the weight they would not have cost $22 it’s just insane