A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
Shock mount snappers! Check to make sure the bump stops have also been extended appropriately. If not they are well known for snapping the shock mounts off as the suspension bottoms out on the shock rather than the bump stop.
And no, they aren't designed to swivel, but twisting like that is inevitable as the friction of the nut alone is not enough to hold them aligned.