Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @Kalmatt, thanks for joining the Fitbit Community, it's great to have you on board! 
Which tracker are you currently using? Have you experienced this issue before? It will be very helpful for me to get more details about your situation so I can check this further, a screenshot will be great if you're able to reply to me with one where your exercise is showing.
In the meantime, please restart your tracker and try perform a new exercise to check if the time on the exercise is correct.
I hope this can be helpful, give it a try and keep me posted!
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hello @Kalmatt, I hope you're having a great day, thanks for taking the time to reply!
Depending on the tracker you have, it will auto-detect your exercise as long as you've performed it without interruption for the time established on your settings. You can check this settings by going to the Fitbit app > Account > Exercise.
In here you will be able to adjust the time the tracker will take before start auto-recognizing your activity. Tap on each one to set up the time for each activity.
Please remember to sync your tracker after making any changes in here.
I hope this can be helpful, give it a shot and in case you need anything else, please feel free to reply!
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