I have always seen occational and expansion cases usually be greater in stress than the sustained. Now however, my sustained case is the highest stress. I am at a loss to explain this. I am wondering if there is an error in my setup. My intermediate cases are combined algebraically while my overall stress cases are combined ABS. Any ideas would be helpful. My setup is posed below...

W+H(HGR)
WW+T1+P1(HGR)
WW+HP+H(HYD)
W+T1+P1+H(OPE)
W+T2+P1+H(OPE)
W+T1+P1+H(SUS)
W+T1+P1+H+U1(OPE)
W+T1+P1+H-U1(OPE)
W+T1+P1+H+U2(OPE)
W+T1+P1+H+U3(OPE)
W+T1+P1+H-U3(OPE)
W+T1+P1+H+U1(OPE)
W+T1+P1+H-U1(OPE)
W+T1+P1+H+U2(OPE)
W+T1+P1+H+U3(OPE)
W+T1+P1+H-U3(OPE)
W+T1+P1+H+WIN1(OPE)
W+T1+P1+H+WIN2(OPE)
W+T1+P1+H+WIN3(OPE)
W+T1+P1+H+WIN4(OPE)
W+P1+H(SUS) (alg)
L4-L21(EXP) (alg)
L5-L21(EXP) (alg)
L4-L5(EXP) (alg)
L12-L6(OCC) (alg)
L13-L6(OCC) (alg)
L14-L6(OCC) (alg)
L15-L6(OCC) (alg)
L16-L6(OCC) (alg)
L17-L4(OCC) (alg)
L18-L4(OCC) (alg)
L19-L4(OCC) (alg)
L20-L4(OCC) (alg)
L25+L21(OCC) (abs)
L26+L21(OCC) (abs)
L27+L21(OCC) (abs)
L28+L21(OCC) (abs)
L29+L21(OCC) (abs)
L30+L21(OCC) (abs)
L31+L21(OCC) (abs)
L32+L21(OCC) (abs)
L33+L21(OCC) (abs)