SASS: Extra selectors added from extended class? -

i attempting use modernizr class extended class. have following scss code:

%some-extended-class {     color:red; } .no-csstransforms %some-extended-class {     color:blue; }  .class-one {     .class-two {         .class-three {             @extend %some-extended-class;         }     } } 

note 2 extended class declarations; second preceded .no-csstransforms modernizr class. expect get:

.class-one .class-two .class-three {   color: red; }  .no-csstransforms .class-one .class-two .class-three {   color: blue; } 

however, output getting:

.class-one .class-two .class-three {   color: red; }  .no-csstransforms .class-one .class-two .class-three, .class-one .class-two .no-csstransforms .class-three {   color: blue; } 

note .class-one .class-two .no-csstransforms .class-three, unnecessary, , don't understand why being added?