Hello @Lisayoung, thank you for joining to the Fitbit Community! Note that only in rare occasions I've seen the data is changed to different amounts, specially in a drastically way as mentioned. So with this some questions came to me.
Are you using more than one tracker in your account, meaning a Surge and another of a different Fitbit type? How frequent is your tracker syncing with your account?
One way to address this is by setting up your tracker again as a replacement. Just make sure to sync any recent data from your tracker before you proceed. For more details please use the following post as a walkthrough.
In this case I reviewed in our list of compatible devices and I wasn't able to find the mobile of your phone. This necessarily doesn't mean it won't work, but we cannot guarantee the behavior of the phone in relation to the functionality of the Fitbit app. This other post might come handy to address syncing issues: Having trouble syncing? (here's how to fix this).
Hope this helps. See you until the next one!
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