Sync settings not working correctly

Hi There,

I am using Lightroom CC 9.0. I am trying to convert B&W DNGs scanned using Silverfast 16 bit RAW and did the steps of updating Silverfast DNG and read metadata after importing the scanned negatives into Lightroom.

I am trying to sync a setting (Brightness) across multiple photos. Whenever I have selected all of the photos I want to work with and click on sync settings, the changes don’t apply until I open the NLP popup using ctrl+alt+N.

Any help?