When I look at the blocks "from a distance" - as in the top picture - everything looks aligned to me.
It may be that one's eyes/brain just sort of "fill-in" to what it's supposed to be, but it does look good to me. (I'm really NOT a member of the **, but I DO notice)
Like Deb Watkins wrote, your seams may be a bit "off." It may be that your seams are a bit too deep and that's what causing that. Try deliberately making a seam too shallow and see if it does the opposite and that may help diagnose the problem.