I would think the drawer fronts probably originally had a veneer on it and it has been removed. The base wood seems mis-matched, which would be typical, since it would have never been seen originally, anyway, if veneered.
Surmising (guessing?) your results:
1) Despite sanding, there may likely still be some residual glue on it, preventing proper conditioner/stain application.
2) The base wood is 2nd/3rd grade, so it's uniformity, for finish applications, is not even.... OR the boards seem to be a partially quartersawn/partially through cut.
3) The 3 base wood boards, of that drawer, may not be all the same kind of wood, but this would be unlikely, even for a low-end piece of furnitue.
Your results just appear to be that of trying to stain/finish the basewood, after a veneer has been removed from it.