I'm guessing you're using the stock Bluebell CSL from the .org rather than the ones we provided on our web site. The ones on our site are modified to contain the offsets. Our plugin is the only one that supports the notion of offsets, so if you're downloading the package from anywhere other than our site, it's not going to contain the offsets.
I'll put a note on our site to make that more clear.
I'll also fix that B717 ICAO code, it's supposed to be B712 (that was an error in the original package)