not trying to insult you, but make sure when you use your refractometer that you wash it before and wipe it down really well.
sometimes remaing saltwater will dry out and leave the salt residue on the lense and you will get a wonky reading the next time you use it.
i would definitely think it is a reading error of some sort.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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