It seems like you must have been receiving messages from this sender for a while, so some of the records are in older log files. Auto-training is working for other messages, though. So my guess is that, some time ago, you trained messages from Keith has both spam and good, and that’s why the address is neither blocklisted nor whitelisted.
The log shows that SpamSieve thought the message from August 6 was spam. You say it was good, but there’s no evidence that you told SpamSieve that. It is essential that you
correct all the mistakes or SpamSieve will be working from false information.