Hello @Amr1
Don't worry too much about this as every search will come up differently every time. I'm pretty certain that if you make another search now you'll see that your listing is offered without this split stay coming up.
I'm totally baffled by this split stay option that Airbnb offers and can't imagine many guests wanting to change accommodation mid way through a stay to go only a few meters away but frustrating for hosts when their dates are available on their calendar.
All the best Amr
Joëlle