You would be able to see which permissions you granted within the Fitbit app from your Profile > Manage Data > Manage Third Party Apps. You would be able to find KrowdFit there and confirm the permissions allowed include:
-- sleep
-- settings
-- nutrition
-- activity
-- heartrate
-- profile
-- weight
-- location

If you need to change your permissions you would need to remove Fitbit from the KrowdFit app and reconnect it.