what is the problem of this crossover ?

hello everybody... i am code decision variable space to consider it as a chromosome (the value of x from (1 to 56 ))

% Initialize Position of chromosome 

pop(1).Position=randi(VarMax); ( i.e individual1 represent x1=7) 

pop(1).Position=randi(VarMax); ( i.e individual2 represent  x2=7)

when i using this type of crossover and when for example the value of x1=7 , x2=7 , always y1 and y2 = 7 .

what is the type of crossover that enhanced the values of y1,y2 ?

x1=7 , x2=7 , gamma=0.3 , VarMin = 1 , VarMax = 56 ( decision variable space is integer)

is this type of crossover is correct ???

function [y1, y2]=Crossover(x1,x2,gamma,VarMin,VarMax)

      alpha=unifrnd(-gamma,1+gamma,size(x1));

      y1=alpha.*x1+(1-alpha).*x2;
      y2=alpha.*x2+(1-alpha).*x1;

      y1=max(y1,VarMin);
      y1=min(y1,VarMax);
      y1=round(y1);

      y2=max(y2,VarMin);
      y2=min(y2,VarMax);
      y2=round(y2);
  end

please help me..