They are not feeding 2 BBs at once. One feeds and that BB does not leave the chamber; the bolt cycles and feeds a second BB (and in some cases a third and so on).
If the hopup rubber is saturated with oil it will swell up. Then the BBs will jam up.
Folks have a whole elaborate procedure to soak the rubber in chemicals to flush out the oil and dry it. It's easier to just swap it out.
It's a learning curve on how much oil to run in your mags. I have been told that KWA USA won't warranty GBB's run on propane because of users dumping BP levels of oil into them and then returning them for refunds because they've ceased to function.
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