I might've been unclear with my question, let me demonstrate:

You have your string which you want to hash, for example, a question mark (?), in binary, that is:
00111111

Now with MD5 they have different values to run different operations, lets say your value is "b" (01100010) and your are doing XOR:

00111111
01100010
--------
01011101

This new binary value is equal to ], I don't get how it can't get a result like that somewhere.