Granny square blanket

This black and gray blanket I made for my boyfriend... It actually took me a really long time and it was the first one i ever made...  i originally started the middle square just to practice the stitch and went on from there.

Now this baby blanket i just started about a week ago and im almost done.. I started this one for my cousins baby who is not born and we don't know if its a girl or boy so im hoping the colors i chose will be great  for either and i hope they like it..

        I have found out when i do something once its a whole lot faster the second time around and better.. If you didn't see the black and grey one is really off it starts to widen and doesn't sit flat but so far the baby blanket does..  Now if someone can tell me please why when doing this stitch as a go out the corners don't match up (they start to dip so they look lik  ~    <----)   please let me know.. thanks