If your Fitbit is connected to Wellness360 but the steps aren't syncing, try opening the Fitbit app on your phone and allowing it to sync. Once complete, open the Wellness360 app. If it's still not showing the same numbers, it may need to be repeated.
The same can be done on a computer if you are not using the apps.
If it is still not syncing the right numbers, repeat the steps, leave it overnight, and check again.