Apple watch doubles calories///Also 2 the same watches int the health device settings

Hi, i have a problem with my applewatch/ iphone 14 pro max. Since a month i've seen that my apple watch doubles my calories. F.e i made 1000 steps and apple watch shows that i burned 120 kcal. (with my weight its impossible - and about 2 months ago everything was fine). It' also shows some random activities on excercise ring, while im sitting, and adding some random burned kcal while im just sitting. I called the support service but they are not helping. I've seen that when i go to the settings> health > device it shows that i have 2 the same apple watches sync with my phone, and when im deleting this device, it adding itself automaticly about few minutes. Can anybody help? its so annoying, thanks.