Erm there wasn't anything particularly strange about how I built this
I took me mechanical spider from my blog (walk.bsg) and removed part of the wooden legs for balasts (standard weight) and then put some braces in between.
As mentioned before it was rotated around 270 degrees (it said 270 but it can be 269,8 or so I think)
walk.bsg
And as mentioned before, I set rotation back to 0 (with that button, so it's absolutely 0 degrees)
Then I removed it and placed it back and again it was crooked.
However, at first I started the brace on the top and ended on the bottom, but when I did it the other way around the brace got attached the proper way on both ends.