A strange query of queries bug in CF11?

Hi,

I have this strange query of queries result that could be a bug in CF11.  The result is correct in CF10.

Basically, I have 2 queries, qrA and qrB.  I do a join of the two in joinQr, after which I do a query of qrA.  Since I didn't alter qrA in any way, I would expect a query of qrA to give me qrA.  However it only gives me one row ("XS").  Now, here's the strange thing: