Bulk update - updates fields not altered

Maybe a just a quirk - seems innocuous

doing a bulk update on a different field, I noticed in the verification window these updates - with the exact same info previously in the field - in a field I didn’t touch

Used MSExcel 2010 for modification.
Have been doing bulk updates for hours and this is the first time I noticed something like this.

Maybe a formatting changed caused it to seem diff to Manager?

I have noticed this when doing Batch updates in the past. Not a problem, as it does not affect the effectiveness of the updates.