I've got a Edge 800 and over the past week when I sync using garmin express the activities are all sync correctly into Garmin Connect.
My Garmin Connect is also linked to MyFitnesspal - when I check the exercises in MFP the data has been doubled up:
Bicycling, 19-23 kph, moderate (cycling, biking, bike riding) 63mins 691calories
Bicycling 63mins 691calories
What's going on - is this a issue with Garmin?