That's because it's only a low level at the moment (I'm assuming you have the level 5 one from wi-fi).
When you EV train the stats are added gradually and evenly up to level 100. So if you got 50 points worth of EVs before levelling up, you would only get one added about every alternate level you go up.
But by level 100 your stat will be 50 higher than if you didn't EV train. At level 50 you will be roughly 25 higher than without EVs.