Ann please TraditionalForm like this as much as you can, there is a bug in 10.3 Mathematica with the old way we were coding i.e. ToString[expr, TraditionalForm}

TraditionalForm[(x+y)*(q+p)/(m+n)]

Or

TraditionalForm["(x+y)"*(q+p)/(m+n)]

Or

TraditionalForm[Style["(x+y)",Red,FontVariations->{"StrikeThrough"->True}]*(q+p)/(Style["(x+y) ",Red,FontVariations->{"StrikeThrough"->True}]*(m+n))]