It would be interesting to get a few of the remaining cartridges that got "wet" ...if any remain. Then cut a few open to see if the steel shot had oxidized and possibly fused together inside. Normally these factory loads are fairly waterproof. If they went "bang" then they couldn't have gotten too wet for very long...
Still, I'd suspect a barrel obstruction of some sort. What happened with the barrel between the second and third shot?
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