Same issues here - use PayPal + USPS to create shipping labels basically every day over the last 8+ years and have only had this issue maybe once or twice (and those times it WAS my fault). I got 3 separate emails a few minutes apart the other night due to underpaid postage - but I'm 100% sure the packages had the correct postage on them. I even went back and put in the exact measurements and weight of the products I shipped to those 3 locations and guess what... they came up with the price I initially paid in postage. Two of the emails stated I only owed about $5 in total for the two packages but the first email stated I owed an extra $18 (when the initial shipping was only $16!). Extremely frustrating to say the least. I paid the postage and am chalking them up as business expenses since I need to continue creating shipping labels. Hope this doesn't continue since contacting the Post Office and waiting for their response seems like a waste of time unfortunately 😞
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