The issue with Ava (2020) matching Onward (2020) is known and Plex has said they’re investigating. (This does seem to be matching correctly with the latest preview Scanner/Agent.)
There are a couple of workarounds to get it added with a current date.
One is to move the file for Ava out of any Plex-monitored directory, scan, empty trash, and clean bundles. Then name the file something that cannot match any other movies you have, add it back, scan. Then manually fix the match to Ava. Then rename the file to the correct/original name, and scan again to make sure it detected the rename. It should, and should also have a current date.
Or if you’ve already got it split from Onward and the only issue is the added_at date, you can do this if you are comfortable.
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Sort by Title is a special view because it also includes Collections - so the number of items will be larger.
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One effective way to look for files that may be incorrectly matching existing movies is the Duplicate view.
