Latest problem: same lines over and over in log ...

Why would this be happening and how can I fix it?

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Trained: Spam (Manual)
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
From: ORCInternational@orcsurvey.com
Identifier: Lib48b1paSAEO3vPVITU0g==
Actions: already in Spam corpus (1287)
Date: 2019-02-19 21:03:50 -0500 (EST)

Mistake: False Negative
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
Identifier: Lib48b1paSAEO3vPVITU0g==
Classifier: Bayesian
Score: 27
Date: 2019-02-19 21:03:55 -0500 (EST)

Trained: Spam (Manual)
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
From: ORCInternational@orcsurvey.com
Identifier: Lib48b1paSAEO3vPVITU0g==
Actions: already in Spam corpus (1287)
Date: 2019-02-19 21:04:12 -0500 (EST)

Mistake: False Negative
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
Identifier: Lib48b1paSAEO3vPVITU0g==
Classifier: Bayesian
Score: 27
Date: 2019-02-19 21:04:17 -0500 (EST)

Trained: Spam (Manual)
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
From: ORCInternational@orcsurvey.com
Identifier: Lib48b1paSAEO3vPVITU0g==
Actions: already in Spam corpus (1287)
Date: 2019-02-19 21:05:05 -0500 (EST)

Mistake: False Negative
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
Identifier: Lib48b1paSAEO3vPVITU0g==
Classifier: Bayesian
Score: 27
Date: 2019-02-19 21:05:11 -0500 (EST)

Trained: Spam (Manual)
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
From: ORCInternational@orcsurvey.com
Identifier: Lib48b1paSAEO3vPVITU0g==
Actions: already in Spam corpus (1287)
Date: 2019-02-19 21:06:17 -0500 (EST)

Mistake: False Negative
Subject: You will be entered for a chance to win a $100 gift card! Share Your Opinions.
Identifier: Lib48b1paSAEO3vPVITU0g==
Classifier: Bayesian
Score: 27
Date: 2019-02-19 21:06:22 -0500 (EST)

My guess is that you are using the drone setup, and this message is in the TrainSpam mailbox, and Mail received a batch of messages at once that triggered multiple invocations of the remote training script. Because the script is not atomic, it’s possible for one invocation to see a message that another invocation has already trained but not yet moved.

I don’t think this is something that you necessarily need to fix—it won’t mess up the training—but I’m working on improving the way remote training works so that this doesn’t happen.

Yes, I am using the drone. This was happening over several days.

I finally located the single rogue email and deleted it, which stopped the associated bogus logging.

Glad you figured it out. It sounds like there was a message that Mail was not able to move out of the training folder. Manually deleting it is the proper solution.