Yes, it looks like the Separate Category sidebox is giving incorrect cPath links. The rung lock kit is in cPath 236_238, but the SC link points to cPath 238, which is not actually a top category but a subcat. This may also affect the breadcrumbs which do not display correctly on the cPath=238 page.

I don't know the code used in the mod, so can't say what may have gone wrong in your copy of it.