I've used the bag when filtering hops to my secondary or bottling bucket. Usually I tie the bag to the end of the cane with the bag floating in the wort. This has worked well and I leftmost of the hops behind. Last time I tied the bag high up on the cane with the bottom of the bag snug against the cane. This resulted in a lot of oxygen and bubbles running through the tubing. Was this a fluke or is the correct way to leave the bag loose in the wort?