I think there may have been an oversight in the answer key for Tae Kwon Do. This may be a spoiler, though. Anyway, the booklet didn't specify to use units digits, but the answer is marked as incorrect if you put in the full digit string. I'd assume that due to this oversight, appropriate errors will be rectified and the score will reflect the original time of the "error" in the answer key. Edit: This is particularly important for people, like me, who solved using ONLY the penpa link, and didn't see the instruction that was in the puzzle but not the IB.