I would contact them because it’s so unusual, but as previously mentioned, I doubt it is a mistake. It is possible for TS to change without any science scores changing, as it is not the average of BIO, OC, and GC. It is my understanding that the ADA audits all responses to verify the accuracy of scores. Perhaps you were just unlucky and they decided the previous TS score was not accurate after further review of the 100 science questions you responded to. Still, I would definitely inquire as to why your score changed, and please let us know what you find out!