It's hard to explain what we saw in the video -- the hammer did not lock, and the empty stayed in chamber after firing. He had to pull the bolt open to eject the empty case.
Assume the magazine spring was weak. That would explain the next round did not load, but that alone does not explain why the empty case stayed in chamber. If we assume the extractor had an issue, so the empty case was not extracted, and, the magazine spring was too weak to push the next round up quickly, that's possible. But, why didn't the hammer lock after firing? It might also has a sear or disconnector issue. But there is another possibility -- this gun's bolt lock might be mismatched and did fit the gun well, could the bolt occasionally locked too long time, and the residual pressure was not enough to open the bolt? It's possible as well. Or, reload ammo is too weak to finish the recycling work??
Too many possibilities.
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