Why is it doing this?

[Domanating]

Sorry if it's already been posted (the search option had a harsh day again) but i want to know why is this happening from every angle or side. Each time i want to bend 2 faces of a bot from one side i get them bended inwards and from the other side outwards. It makes the structure uneven. I don't even care if i want it to bend inwards or outwards i just want it symmetrical 

I'm running RA2 v1.3 downloaded version with DSL-TC 2.0 followed by ACAMS textures mod. No more changes were made

[NFX]

It's because the face is going from being vertical to being a wedge, so the faces need to twist in order to fit the framework you're laying out. To get around this, simply pull the other front corners back by one square, and that will keep them at the same angle, removing the twist that you're wanting to get rid of..

[Domanating]

Thats it? That easy?  Wow, thanks a lot, m8

[NFX]

Pretty much, yeah. That's what it means when it talks about "Cannot move that point because it will bend one side too much".