TMVA - cuts SA xml efficiencies file doesn't match ROC curve


I am using the optimization method Cuts SA for my analysis.
When I use a certain amount of variables, the ROC curve
displayed by the TMVAGUI starts acting strange and does not
match at all the efficiencies given by XML weight file.
Has anyone encountered something similar before?

This problem goes away when I decrease the number of
input variables.

Thank you.