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So, what exactly does "The carrier was fouled" mean?
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It means it needed to be cleaned. It may just be tech-talk for "we don't know" or "we won't tell", or the bolt carrier may have been heavily fouled by the ammo you were firing.
I don't buy the gas ring misalignment explanation, I have seen ARs fired
without gas rings and they worked fine, the gas rings are just a little bit better seal as the BCG gets worn or dirty.
BTW, 7.62X39 operates at lower pressure than 223/5.56 NATO, so that may really be critical on a DI design. Who knows?