I read somewhere (possibly/probably here) that the oil tends to separate in coconut blocks and congregate at one end; if this is the case, then I would have expected that the yellowish end woulod be the solidified coconut oil, and the coconut solids are the white end, but as you report more yellow than white, then I may be wrong (unless there really was only about 1/3 coconut solids in your block, which I suppose is a possibility).
** Phil.