staad Utilization for bigger section higher than lower section

good day, i tried designing a simply supported steel beam on staad pro using the same loading but i tried different Dmax

 

UB 533X210X138 = Utilization ratio= 0.9852117

UB 457X191X161 = Utilization ratio = 0.75

 isn't the lower steel section supposed to have the higher ratio?

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