Silked spawners have names of mobs attached to them - they were created last year when we had a plugin that allowed spawners to be picked up. That plugin was removed because griefed spawners failed to leave logs for logblock. Now some of the spawners picked up during that time still remain in people's storage
You can change it after you place it, but there is no way to pick it up again and have the mob name attached. Currently the only way we "pick up" spawners is by destroying them and giving you a fresh one. If you want I can show you a silked spawner tomorrow in game.
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