nanners don't generally produce a bunch of pollen on their own. if it was a full sac that grows out of the buds, think about removing entire plant immediately.
2? maybe a light leak near there. pull it back a bit, make sure it was a sac. just nanners, keep pulling.
almost assuredly a light leak or genetics.. flip a coin. exhaust ducts even with 4 90-degree bends won't keep light out if not painted black inside -- common problem that you don't realize occurs..