When this happened to me, a Marans breeder told me that I was finding out the hard way that my BCM had wheaten genetics. Here's our RIR/BCM cross on the left.
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BCM should always breed black (because it is dominant) unless it carries a recessive gene for brown.
I was also told that it was a good idea to take any potential BCM rooster breeder and cross him with a brown hen about 20 times to verify whether he is pure.
So we pulled ours out of the breeding pool.