The magical threshold 20
It seems that up to 19 days (i.e. when i type "19 days" in the text box), i have on the screen my list of tasks up to 19 days. When i enter 20 or up to 31 days (the maximum limit i think), then the list becomes completely chaotic, i.e. dates are not sequential (not even project).
Weird, because i remember having no such problem some months ago.