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
It's great to have again here @SunsetRunner! Hope you're doing great! Thanks for including all those details, apparently you have checked everything on the Settings. I would like to know if the inaccuracy regarding your data, is specifically for some workouts or if you're seeing inaccuracy on you stats for the day. Are you manually logging information? What are the activities that you do most of the days? Are you comparing distance with other device? 
About the distance discrepancy, also check your workouts automatically tracked by SmartTrack, since those exercises don't track distance for your overall stats for the day. It will give you steps, duration and calories only. So, it might be that this is why you don't see all the distance information in your Dashboard. Remember that using the ShortCuts from your Surge, from the Multi-Sport option will give you all the stats including distance and a map information, for GPS activities. I think that it might be a better option to use in case that you haven't noticed so.
I would also suggest to take a look of this master post in regards floors, so you can check some amazing facts on how this stat is tracked. 
I'll be around in case you have more questions. 
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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
Hey @SunsetRunner! Thanks for getting back! Don't worry it's okay, I was happy when I saw the notification about the accepted solution, though! But it's okay. I really want to help you to take advantage of the different features and functionality of your Surge. So, let's check your questions one by one! 
- In regards about the accuracy of distance, I want to know where you're getting this information. Are you checking the information of each activity? or Is this the overall for the day? Also, if you're using GPS for tracking walks or runs.
- About Yoga activities, remember that this is not a base activity exercise; so must of the information that you get is taken by the HR monitor to give you calories burned. Also, let's take into consideration that if you compare trackers, they not always will give the same information since every tracker has their own algorithms. Please check this master post to get more information about how to track Yoga activities.
- What are the Shortcuts that you're using, so we can check the information that you're getting. If you can add pictures of the graphs or of the workouts with all the stats, it would be great!
- Your HR monitor, will give you the readings depending on the activity and how you're wearing it (see some wearing tips); some others factors like temperature, humidity, stress level, physical body position, caffeine intake, and medication use are just a few things that can affect your heart rate. In case that it is having some hardware issues restarting your Surge might help to get a better reading. Please note a Fitbit tracker is not a medical device, you should consult your doctor before starting an exercise routine.
- In this post you will find more information about SmartTrack. In case that you don't know all activities recorded by this feature don't take in count distance for the overall stats.
Hope this helps, I'll be waiting for your response!
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