I’m not sure then - as long as you access the site collection from one of the url’s listed in Deployed To, it should be listed in the Site Collection Features. Next thing I’d suggest is to retract the solution in Central Admin, followed by a Deploy and then see if the site collection feature is there. If that doesn’t work, i’d try running the deploy powershell script that came with the FBA Pack, which should remove + reinstall everything:
.\deploy http://arsftpprd/sites/mysitecollection (but using the url to your site collection).
The above should activate the feature as well, so it should just be working after running that.