Adding additional statements to Wikidata property

Hi, I am still having problems with this issue. New data was just published, so I tried again with that new data. However I am still seeing the same issues:
I am able to successfully add new statements, but where a statement already exists and I want to add a second value - eg instance of, published in the second value is not added, though my reference for that value is added.
Also the title is not overwritten with the updated sentence case metadata, and remains in upper case, with a second reference added. Example: Russia’s networked authoritarianism in Ukraine’s occupied territories during the full-scale invasion: control and resilience - Wikidata I've tried the suggestions above. Is anyone able to help?
Thanks, Helen