I just realized that my Olympus camera is adding “OLYMPUS DIGITAL CAMERA” to the Image Description field in metadata, but I’m baffled. I don’t see Image Description in the list of fields to override when importing, and I can’t figure out how to change it (remove the text) in photos I’ve already imported. But I see Image Description listed in the EXIF fields in the left hand column Inspector.
Are you using the new Lightroom; the version that's the same (mostly) on desktop and mobile? Then you may have noticed that a few features are NOT actually on both platforms. The ones that get me the most are Copy Photos (ie duplicate photos) and Batch Paste. I've found a way around it… in a round about sort of way. Check it out!