In the process of bending your pins, you put stress on the socket which, in turn, loosened its grip on the tube. If the tube glows and the amp sounds normal, I wouldn't worry about it. If you're anal retentive and want to restore its original grip, you can use a pointed object like an awl to bend the socket contacts toward each other. Don't go overboard. They only need a slight tweak. Of course, before you do anything, unplug the amp and let it sit for a while before you start poking around.
