Hi,
The CUI datasheet shows that for models 12C and 20C it's full a cycle (4 counts) per detent while for the 15P30 it's half a cycle (2 counts) per detent. It's a bit misleading that they state for example, 12ppr, 12 detents when it's actually 12cpr, 12 detents.

The Grayhill datasheet explicitly says 1/4 cycles (1 count) per detent.

So, yes, "problem" explained/verified.

/Henrik.