Unique IVs producing identical ciphertext using attr_encrypted

Using the most basic setup:

class User < ActiveRecord::Base
  attr_encrypted :name, 
                 key: 'This is a key that is 256 bits!!', 
                 encode: true, 
                 encode_iv: true, 
                 encode_salt: true
end

The results look like this in the database when supplying an identical name:

╔════╦══════════════════════════════╦═══════════════════╗
║ id ║ encrypted_name               ║ encrypted_name_iv ║
╠════╬══════════════════════════════╬═══════════════════╣
║ 1  ║ aVXZb1b317nroumXVBdV9pGxA2o= ║ JyE7wHups+3upY5e  ║
║ 2  ║ aVXZb1b317nroumXVBdV9pGxA2o= ║ uz/ktrtbUAksg5Vp  ║
╚════╩══════════════════════════════╩═══════════════════╝

Why is the ciphertext identical? Isn't that the part of the point of iv, which the gem is using by default?