I had a similar problem, what happens is the hop up is too low to hold the bb in the 'chamber', so it either rolls out the barrel or rolls back into the gun and gets fed with another BB, and then when fired one goes and the other rolls out with no power.
You need to make sure the BBs stay in the chamber when they're fed in. If you load the gun, cock it, then pull the slide again, see if the BB can roll back into the gun from the barrel. If so, you need to turn the hop up higher. Just turn it until the BBs no longer roll freely from the barrel. Also, you could try using slightly larger BBs, though all are listed as 6mm, some brands are in fact slightly larger and some smaller.
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