Basically it's linked to my '1', '2', '3' and 4 keys. They seem to be linked together with other random action bar buttons. I'll post 2 screenshots here that can explain it better.
Whenever I respec, change stance or do anything these spells get changed and they just replace whatever that was there before.
Here's situation one, as you can see Mortal Strike is both bound to 2 and S0. I don't want Mortal Strike on S0, so whenever I drag MS away from S0, MS also automatically gets dragged away from 2.
http://i.imgur.com/HVxnf5B.jpg
For example I replaced MS with Taunt only on one button, but then MS also gets replaced with Taunt on the other bar button. It's fucking stupid I can't even play like this... you can also see Rend and Victory Rush duplicated on the bar on the right, whenever I replace it, it also moves from the other bar.
http://i.imgur.com/KEAkmJU.jpg
Don't really know how to explain this shit as English isn't my first language but I don't know what's going on here and I don't know how to fix it either.