Has your center tube eroded back at all?
P.S. This is definitely NOT normal. That center jet is oxygen starved. Oxygen seems to be getting to the outer tubes and mixing properly, but not to that center tube. If your center candle was just a tiny bit longer than the other ones, that would be o.k. But, you said that it is 1 1/2 times the length of the other candles and that just is not normal.
Of course, this is just my opinion.
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