Chronotype isn't working

Detailed description of the problem:
I’m on vacations since a few days, I was interested to see how it would change my sleep habits.

Steps to reproduce:
I’m sleeping from like 1am to 11am
Before that it told me morning lark 2, and now I would be a morning lark 4 ?

How can the middle time of my sleep be earlier ?

I had to manually add three hours today because it somehow stopped by itself around 9am

I think it doesn’t calculate well the mid time of the sleep, if I do it manually it’s more like 6am than 3am