Apple Watch Total Calories Not Calculating/Accurate

Hi -- when I look at my Activity app on my phone the total calories are completely off (1008 total calories compared to 968 active, as seen in the image below) and not calculating -- sometimes not at all or other times just barely above the active. I have unpaired my watch and repaired it before to see if that would help and it didn't. Any other ideas why this might be happening? I think I have all the settings as they should be. Thank you.