Hi,
the result we have for BL hostkarma.junkemailfilter.com is the follow:
hostkarma.junkemailfilter.com blacklisted (127.0.1.1)
In this doc:
http://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists#No_Blacklist_List
127.0.1.1 means no BL (nobl listed - not a spam source - do not blacklist - maybe whitelist)
So seems that blcheck returns the wrong value.
You can check with:
blcheck -p 185.152.70.137
regards
emiliano