Exercise monitoring wrong !!!

[Eamonn731]

I have been doing the same workout for last 4 weeks  1hr treadmill walking 6kph incline 5 degrees ...always recorded at 450 odd calories burnt ...but now recording at 254 cals ?...any ideas 

[Haphuong]

I've recently experienced the same issue. No matter how hard I workout - if I select circuit training, it tells me I burned 162calories for a 30 min workout. I haven't found a solution to this - and starting to wonder if buying a new Garmin is the best solution.