Experiencing unusual USPS label price adjustments?

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.

even if u input 7.52 which I’m sure was your actual weight, it is still the same postage as 8 oz that you must have paid to begin with. I’ve been shipping for decades and it’s the first time something like this ever happened to me. I always round up, never down. They will refund us (if they don’t want a class action lawsuit), the question is when?

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