Hi there @Renston21, welcome aboard to our Community. This is certainly an unexpected behavior from your Flex. I recommend to try with a restart on your tracker. If you need more help with these steps, take a look at this post from @DW50.
If this is not working, I recommend to pair your tracker as a new device on your existing account:
- On the Fitbit app for iOS dashboard, tap the Account tab.
- Tap Set Up a Device.
- Choose your tracker and follow the onscreen instructions to continue.
This should reset the configuration of your account.
Hope this helps and let me know if the issue persists.
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