I'm Guessing that the detent on the elevation wheel is nothing more than a spring with a check ball on the top of it. Sounds to me like the spring/ball has worked it's way out of alignment.
Have you tried taking the windage adjustment off? On my Bushy, one side of the windage is a knob, the other side, a flathead screw. 'IF' your brave you might try disassembling it and see what you can find underneath it.
If not, then I'd try sending it back to the manufacturer for some warranty work.
Good luck!