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A warm welcome to the Community @Ekhobbs85. Your Fitbit Blaze may give you credit for extra floors for a variety of reasons. Occasionally your tracker may detect pressure changes unrelated to elevation gains, such as a gust of wind, weather change, or opening a door.
Exposure to excess moisture can also result in extra floors being counted. This happens if the pathway to the altimeter on the back of your tracker becomes temporarily blocked with sweat or water. To negate all the extra floors you can manually log the activity "Driving" by doing the following from your Fitbit app:
1. Tap the "+" icon
2. Tap Track Exercise
3. Enter your information
4. Tap Log It
5. Sync
I hope this helps, let me know the outcome. 
Best Answer