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sleep accuracy

Hi, I bought 2 venu SQ for my wife and I, sleep tracking is very important to me. I own a fitbit surge which is pretty accurate with the sleeping time record. The venu SQ for my first night of sleep recorded more sleep than I got, it says only 9 minutes of deep sleep. It didn't record my 2 hours nap as well so I put my sleeping time on all day, then it recorded around 50 minutes of deep sleep during my nap but no REM sleep at all. Is the sleep tracking completely broken? why to even bother adding the feature on their watch?