Apple Watch series 7 calories burned too low

Just upgraded to a series 7 and the calorie count (total calories) for my workouts is about 200 less on my new watch compared to my old Apple Watch. My old watch reading da were def correct as I’ve tested them against numerous other devices and gym equipment. I’ve checked everything advised to fix online, health app data correct, HR is reading correctly, calories are selected (not kj), selecting correct workout, calibrated, wrist detection and location services on and still no difference. When I compare my workouts history, just a simple Watch upgrade has now resulted in my calories burned being significantly less. Anyone else having these issues?