I have 5 applications and all are quite same from the OS/display point of view and all have been released with minimum OS version "none". I have tested that those 5 applications work in QT enabled symbian devices(no matter if it is Anna or Belle). In the OVI store those are listed quite differently. Changing target device in the OVI store leads this kind of result:
E7 Anna: all 5 listed (a,b,c,d,e)
E7 Belle: 3 listed(a,b,e)
603 Belle: 3 listed(a,b,e)
N8 Anna: all 5 listed (a,b,c,d,e)
N8 Belle: 4 listed (a,b,c,e)
So what could lead this kind of result?