Yes, the replicator may be broken, however I don’t think this specific issue you showcased here is a bug.
When you replicate an object with the replicator, it creates an instance of an object that you cannot modify with your makerpen. What it looks like happened is you may have connected an event receiver that is constantly spawning objects at your position.
You will have to use the “return replicated objects” port on your replicator to remove all these objects from your room. They also despawn as soon as you reload the room.
If this is not the case, can you specify a little more about this bug you encountered?