I do not know a reason for the "BADNAMES" kw to be added to the images. I can only suggest the way you might remove it from all images-
In the Keyword List panel: [Right-Click] the kw and choose [Delete].
Or, if you want to remove it from 'Selected' images only in Grid view-
In the Keyword List panel:
-Click the arrow to the right of the kw
-Click on the box to the left of the kw (to remove the check mark)
(The prompt is misleading! when it says "add this kw" )
Regards. My System: Lr-Classic 12.2 Photoshop 24.2, ACR 15.2, Lightroom 6.2, Lr-iOS 8.0.8, Bridge 13.0.2, Windows-11.