Distortion on tail?

Hello, I'm new to Daz and could use some help. I used the free dragon that comes with Daz and created a tail for a character by cutting it out in hexagon and recreating the rig...but for some reason it gets all jagged and zigzaggy when I pose it, namely on the tip. When I'm actively posing it's smoothe and stays nice, but as soon as I let go with the mouse it crumples (first pic is while using the pose tool, second is when I let go). It does this when I'm manually adjusting the sliders (bend, side/side, etc.). Does anyone know what's causing this? Thanks!