That it encrypts the same text the same way every time is the whole point of a hash. It's a feature.
If I have a database of hashes of passwords, then I can check that you entered the correct password by hashing it and seeing if the hash matches what I have in the database for you. But if somebody stole my database of hashes, they won't be able to figure out what your password is unless they accidentally stumble upon some plain text that hashes to that value.
