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Hi Chris,
Been a while since I used setting circles (currently spoilt with a goto scope) but I recall two scales for RA on mine. One was for the northern hemisphere and one for the southern.
Since RA is fixed to the objects in the sky, as the sky rotates you will have to recalibrate the RA circle before hunting for some DSO but it shouldn't be out that much when you move it immediately. I'd say you're looking at the northern hemisphere scale. Sorry - I can't remember which one was which on my mount (inner or outer) but I used to do just as you're doing until I figured out which one was which each time I used it.
If you've only got one set of numbers then it's probably northern hemisphere. I'll have to defer to someone cleverer to come up with a hack if that's the case.
Cheers,
Greg
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