What do you mean by "turned" stitches?
If it is what I think, you may not be making the first stitch right on the quilting line. Or maybe your needle is bent?
It is also possible that tomorrow or the next day, you won't be able to see the turned stitches. We work very close to our quilts, and a little distance makes all sorts of mistakes disappear.
By the way, a size 11 needle should be as short as a 12, but as thick as a 10. I find them easier to thread. If you really think your needle is to blame, try them.
Good luck!
Janet