Are you uploading activities from Strava? Those will not add any training load. The load is calculated on the supported Garmin device and it will only do that for activities from a very limited number of 3rd party services: Tacx app, Zwift, TrainerRoad and ROUVY
Exactly. All values are calculated on the Garmin devices. Activities from supported 3rd party services must be downloaded to the Garmin device, calculate the values and then upload them again.