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HRM Pro - Incorrect calorie readings

HI, 

I recently purchased the HRM pro and was really excited about the data storage feature as I use it for Muay Thai, so ideal to not wear a watch with it. However although the heart rate looks correct (in terms of round on vs. rest) the calorie measurement is way off, which makes me doubt all the data. For example at a 1 hour & 20 minute session with an average HR of 132, and often reaching 155 -170 in the bursts of energy, it says that I only burned 167 calories. Which is totally incorrect, but from my side it feels like it makes all the other data questionable and irrelevant. So disappointing, if anyone can help that would be great. 

PS: I am connecting it with a garmin venu - could there be any possibility that the reading/history or data is being collected incorrectly here?

Please advise.