Members failing in SS6 20.07.11.82

Dear Sir,

I had carried our design of steel structure using STAAD SS6 - 20.07.11.33.

While checking the design in STAAD SS6 - 20.07.11.82, few members are failing in that version; mostly in slenderness.

What shall be the reason for the same. Please help me out here. 

Thanks.