Series Sorting

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Let's start with what your end goal is...because this is a very abstract question. There might be a better way to get there. Are you hoping to sort/display by latest aired episode first? Are these actual series? Can you get the metadata from a provider and use that information? Or are you utilizing an outside metadata/organizer program that can alter timestamps/file creation dates?

To answer the abstracted version of your question, I would look deeply at the existing metadata of the file inside of Jellyfin and see what field contains the incorrect timestamp and try to find where that information exists within the file on the host OS (ffprobe, mediainfo, ls -hl, right click > properties, etc...).

The name of the file, in some cases, may even cause this issue. I have a process that pulls down web videos and includes automatic resolution information in the file names -- despite the timestamp, date created, date uploaded, and more info being included in the metadata, Jellyfin still sees these videos as being released in 1920 if they're 1080p (i.e., "1920 x 1080" exists in the title). I'm not sure how to correct that behavior and I can't use a metadata provider to pull information for these videos, so I deal with it.