This is a problem I'm experiencing 7 years after the op.
Could you post a photo of the Calories widget on the watch, and a screenshot of the Calories screen in Garmin Connect, demonstrating the issue? Do you use multiple devices (such as watch + Edge), or just a single one?
This is a problem I'm experiencing 7 years after the op.
The widget is correct but the data will not push to any watch face that I have found.
In that case it is not at all the same problem as it is the topic of this thread, as you claimed. And additionally a watchface question is unrelated to Garmin Connect Web (that's the forum you are posting to).
You could either search a suitable watchface in the Connect IQ store (assuming your watch is the Instinct 2 and not Instinct 1st gen), or create a new thread on the Instinct (2) forum.