CKAN doesn't recognize the new 1.0.5 release of USILS because it's released as 0.1.4 which is "older" than 0.1.5. I'm guessing this was a mistake with an automated release? Manually uninstalling and re-installing will pull the "new" 0.1.4 but unfortunately it seems that it is either an older version or the "Updated costs to not have negative costs when tanks are empty." fix from Kerbas-ad-astra/master didn't make it into the release.