Wide Flange Girder Shear in LEAP

I am using LEAP CONSPAN for a PS/PC wide flange girder analysis. I do not believe the shear capacity provided by the stirrups is being calculated correctly because the shear capacity is nearly constant across the beams even though the stirrups are spaced at 3.5" at the ends and 10" in the middle. Is it possible that the shear capacity is not being limited by Vu/phi as per AASHTO 6th Or is it possible that the stirrup area in in2/ft is being applied at the specified stirrup spacing, therefore applying a much higher stirrup area than what is actually provided?