I have also been seeing this same issue with Pocket starting a few months ago. It previously had my entire Pocket archive on it, but I had to factory reset my device and resync, and when it did it only downloaded the 20 most recent articles and nothing could make it download anything older. I tried resetting and logging out multiple times and the same thing kept happening. So I think something changed, maybe with a firmware update or on Pocket, that broke the ability to sync articles before a certain date.
I tried reaching out to Firefox Support but they told me the integration was built by Kobo and they couldn't help. Does anyone have a way to submit bug reports to Kobo?
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