Only else part is being executed in If-else statement in matlab

I'm working on counting numbers using if-else statement. I'm getting the result, but it's only executing the else part and not looking at the other part.

This is the code I'm working with

i = 0;
j = 0;

if sum( abs( f1(:) - f2(:))) == 0.0
   i = i + 1;
else
   j = j + 1;
end
if sum(abs(f2(:) - f3(:))) == 0.0
   i = i + 1;
else
   j = j + 1;
end
if sum(abs(f3(:) - f4(:))) == 0.0
   i = i + 1;
else 
   j = j + 1;   
end

msgtext = sprintf('Matching = %d',i);
h = msgbox(msgtext);

msgtxt = sprintf(' Not Matching = %d',j);
h = msgbox(msgtxt);

Any suggestions?

Thanks in advance!