Wrong track order

I’m using ver. 3.5.28 (3558).
I’m having a very curious problem : I listen to albums, and I can’t have Audirvana to play an album in track order numbers : it usually starts with track 1, next is never number 2 and so on.
All the track order is mixed.
It happens when I start to play an album.
The sorting arrows on the current playlist don’t work at all.

Can you help me ?

Stupid is my middle name : the random reading option was on !!!
I never use it, and in my mind couldn’t be the cause of my problems…