What brand of Salt did you use for your water change mix? Do you have another test kit just incase that one is bad for whatever reason? When I was using Red Sea Pro even that didn't mix up that high of ALK. Weird..
Test it a couple more times to see if its true. I had a batch of reef crystals that tested 11 consistently so i did some research and turns out that RC is sometimes inconsistent. I still used it just in very small quantities mixed with other batches
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