Gridfinned

I have recently created a rocket based off the Falcon 9, but when I deployed my custom landing legs, the engine shut off each time a leg locked into place. I am using grabbers at the bottom and a custom hinge to deploy the landing legs. Whenever the grabbers hook on to the legs the engine turns off. I'm wondering if there is a way to turn off this setting. This is my first post, please tell me if I did anything wrong!