It's already been mentioned, but I got the same response this morning, confirming that this is considered an error and that they will be sending updates removing this code to Equifax and Innovis by the end of this week for ALL people affected.
I was also informed that they are now allowed by some new regulation to report this to credit bureaus if you are making anything other than Level payments. I didn't think to ask what precisely is allowing them to do this, if someone else could do that it would be great.
Finally, they seem to be unaware of the consequences of this coding so I volunteered at their request to be a guinea pig and send them a copy of the affected parts of my ScoreWatch report, 103 point drop, seriously delinquent notation and all.