Does it need a new battery? Those electronic scales can get a little crazy when the battery starts to get weak.
I thought that was the problem with ours, but I weighed on the electronic one and a balance beam one we have had for years, they were right on with each other. (electronic was 146.8, balance beam 146.75)
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Princess Coral to Alaska 08/27/07, Carnival Paradise to Mexico 09/20/10