By default Poshmark produces labels in in 8.5 x 11 size which won't fit correctly on 4x6 labels.
Please kindly update your label size setting on Posh Mark to 4x6.
To select your shipping label size, go to: Account Tab -> My Seller tools -> Shipping Label Settings
Reference:
https://support.poshmark.com/articlesDescriptionPage?id=ka01I000000aaxtQAA
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