The Kitchen Drawers started to hit the counter top edge. The rear frame is mounted to the counter top and not attached to the floor.
The vertical frames started to pull away from the top of the frame. They used staples to join the pieces together and the vertical pieces started pulled away from the staples.
I lifted the frame up and put on two flat corner braces at the top and two regular corner braces between the frame and floor.
I would suggest that you pull out the top drawer and make sure that the frame is not pulling apart.
Also the shelf under the sink started to sag and I put a strip of wood between the floor and the bottom of the shelf frame.