I have the same issue with Edge 1050 + Instinct 2x solar combination.
I've seen multiple times the following situation:
1. I record my workout on Edge with power, heart rate, speed and cadence sensors. Watch stays at home.
2. Edge syncs after workout. For a few seconds calories appear in Connect app correctly
3. watch syncs, calories get removed like no workout has happened
Same goes for intensity minutes and training load. I've ended up recording all my rides on the watch. After workout I discard Edge activity.
I've tried following things to troubleshoot:
1. do a 'seed ride' double recording on Edge and Instinct. This causes Intensity minutes and calories to show up on subsequent rides recorded only with Edge but they are undercounted. Also seed ride needs to be repeated every week or so.
2. wear the watch without starting activity recording. This completely fixes intensity minutes but watch overwrites active calories to 0 probably thinking that no workout has happened. Non-active calories are kept but in intense activity that's maybe 20%.
3. set Edge as primary training device. This fixes calories but not intensity minutes and breaks fitness metrics on the watch. Instinct asks me to turn on Edge and sync multiple times a day.
