I am working on an EOG algorithm and fined the accuracy and FCR (false command ratio) of as done in a paper they found (IoT platform based on EOG to monitor and control a Smart Home Environment for Patients with Motor Disabilities by Julian Molleapaza-Huanaco). I looked at the definition off accuracy and FCR:

FCR = (num of false commands detected)/(total number)
acc = (num of commands detected correctly)/(total number)

However the papers results the acc and FCR do not add up to 100% and exceed it in one case?

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I was expecting accuracy + FCR = 100%, have I understood FCR and acc incorrectly? If so pl explain what exactly should I consider when calculating them (algorithm error, ser error, commands that are ignored).