Ok, that sounds a bit strange then. 
Do you perhaps happen to have some NCAP_DISC or NCAP_SEMI attributes defined in the model run?
Because VEDA normally uses the DSCAUTO switch, specifying any NCAP_DISC/NCAP_SEMI would indeed automatically activate MIP solution. But that's basically the only explanation that I can now imagine for you having MIP solution without DSC or DUC.
Do you perhaps happen to have some NCAP_DISC or NCAP_SEMI attributes defined in the model run?
Because VEDA normally uses the DSCAUTO switch, specifying any NCAP_DISC/NCAP_SEMI would indeed automatically activate MIP solution. But that's basically the only explanation that I can now imagine for you having MIP solution without DSC or DUC.