Variation in Sleep Data

Hello there, I am new on this community and also on the app usage, recently I found that on the dashboard, stats and graphs I am getting different data according to my sleep duration, I have tried to read FAQ but I still can’t understand why I am getting 3 different information on each of those tabs. Can anyone please explain to me what are this numbers means, and what is the real value of my sleep duration, any help will be appreciated it. Thanks!!

I attached an image where the sleep time duration of 7:46 belongs to the dashboard tab, 7:52 from the stats tab and 6:57 from the graphs tab, all the images belong to the same day of sleep.