You may have the switches reversed. From what I can
discern in the
photo, those appear to be rocker-style switches (rather than the
slide-style switches). With the rocker switches like that one usually
pushes down on the side of the desired selection, which would make
2,4,8 on, the others off. Agreed that this is the reverse of what the
red marks would suggest, so it's rather ambiguous.
They are, indeed!