Bed mesh issue on v-core 500

So I'm having a bit of an issue trying to fix my bed mesh. I temporarily made it a 3x3 mesh to get the gantry square. As you can see in the first picture, I got the right side of the bed fairly close to, but when I start adjusting the left front up, it starts moving the right rear back down. I'm at a bit of a loss on this one and can't quite figure it out. Anyone help me out?