"This script only checks duel modes, because it's impossible to determine from the transfers whether it was a duel to 3 or you bought an item, or someone gifted you the TC, or you took a loan, etc. So, if the overall profit turns out to be negative, it's by no means an error. It might be that you won more in duels to 3 than in duel modes (or you earn TC by other ways)"
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i've sent you a spreadsheet so that you can independently check the moments where you think an error might occur(for example transactions with a big negative number).
although I can check you again if you want, but I vouch that this script makes no errors