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Is there any difference if you switch DIMM positions? By that I mean switch A1 & B1. Same DIMMs, still blue sockets, just flopped. Memory controller module detection can be tempermental.
On that note, it's almost certainly running as single channel if that's what's reported. The memory controller will do it's thing, detecting available memory and type, and storing what it decided was best. The BIOS information screen is just reporting based on what was done.
DIMM components change over time. I'd email Crucial with what you wrote above plus the complete DIMM information and sales order info. You made a good effort at getting compatible sticks but it sounds like you were caught across revisions. Ask if they can swap the older module for one compatible with your new one. Their support is pretty good in my experience.
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