I can't understand Inverse Kinematics So I am relatively new to Blender, and while figuring out the process that is rigging, and applying Inverse Kinematics to my armature, I came into contact with a weird problem, Normally, inverse Kinematics should look like this:


However, that's when I disable weight, which turns into a problem when animating, as weight should be on. This is what happens when I turn on weight:


I'm not sure what I did or what I'm not understanding, but it doesn't make any sense to me. Maybe someone with more experience could help me out?

So after I worked at it for a little bit, I got it to where most of the armature is normal, however, the lower leg is still broke, it turns into a thin like and is unable to function properly. Any help?
I honestly don't know what's going on exactly with your process, but I've followed this video myself and works just fine:
https://www.youtube.com/watch?v=Pt3-mHBCoQk

Hopefully this helps!