--remove isn't removing all hashes

[forumhero]

using dictionary and hash from the best64 rule challenge http://beeeer.org/best64/ . some hashes are not being removed if using plus. ran dictionary attack showed 8,324 cracked, press the up arrow and ran exact command again showed additional 300 hashes cracked. checked the output.txt and those additional 300 are dups of previously cracked hashes.

hashcat cpu removes all cracked hashes fine. running the same command a second time shows 0 cracked.

this is on windows 7 x64, 2xhd5970 and catalyst 12.2