So, I have a fairly complex armature with IK solvers, and it works perfectly by itself, but as soon as I parent the mesh to it, if I move an IK solver, all of them start jumping around everywhere. Any idea what might be causing this?
Problem solved. Don’t ever mirror a part of an armature while it has some parts that have parents outside of the mirrored part 
Ok, I have another question, is there a way to stop the solvers to wonder far from the actual bone they are connected to?