As the others have said, Calibre remembers the sort order used in your library when it is closed and uses that when you reopen calibre. There is a tweak to force a sort or you can use the View Manager.
But, a possibility is a bug in the initial release of calibre 2.20. This caused some library specific settings not to be saved properly. I thought this only affected settings for plugins, but it might have affected other settings. There was a rerelease of 2.20 after a day or so. Downloading it now and reinstalling might solve this problem.
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