That I don't know.. As far as I know, we have no control over those lookup files... they are generated by Adobe and on their logic... I know of no control that we have as system admins that allow us access to exclude bad data....
I suspect this is the result of multiple fields impacts, which causes the columns to shift strangely in the TSV file (think of this like a tab delineated list... if this file is suppose to extract column 5 and 6, but extra tabs have been added earlier, this row could really be getting the data from "2 and 3", but they look like 5 and 6 to the process). I've seen similar issues with a security tool we ran in the past.. even in my Adobe reports, content that should have been in one dimension got shifted to another...
There are two options I can see:
1. Open a ticket with client care... maybe they can explain the bad data and compensate for it? If this is an issue for you, odds are it could be an issue for others..... and it may be a simple tweak to fix the output.
2. Create a "sanitize" job to check for and remove bad lines of data like this...
I wish there was a third option that didn't involve some development work (from either Adobe or your team), and time to get it completed and tested and deployed...
Sadly, Raw Data feeds don't allow for the use of segments, where you could try to dig into the data and find a common ground way to exclude the data affected by this issue....