Hello @HelenMW good to see you have joined the Fitbit Community! In these cases is happening some sort of a loop, so you need to revoke the access from one of your apps, either the integration from MFP or your Fitbit account.
In other words when you are syncing with your Fitbit account, it will share the exercise in WW achieving points; however sine your MFP account might be integrate as well with WW and Fitbit at the same time, what is causing this, is that Fitbit is also sending the exercises to MFP and from here to WW duplicating your exercise.
My recommendation is to revoke the access from MFP to WW to avoid duplicate points. Try to do this through the App gallery section of MFP.
Hope this helps. See you around in case you need more help.
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