When attempting to make changes to existing keywords within the Platform, you may find that new keywords are created rather than edits being made as expected. This issue is most commonly seen during bulk uploads of keywords.
Here are some of the most common reasons:
If your case is due to the first reason described above, you can avoid it by ensuring that all keyword creation jobs are pushed to the publisher via the Activity Log. You can manually post changes by clicking Post Now. Please note that the nightly sync does not push any changes to the publisher, if the changes are not in To be sent status. You can learn more on Automatic Nightly Sync in the following Help article: Synchronizing Data With The Publishers.