hmmm… i’m surprised that iNat wouldn’t process jobs first-in-first-out, but if you’re only trying to export a few thousand records, you can always do that via the API instead.
there’s a link to a Jupyter Notebook (using a variant of Python) that can help you accomplish this here: https://forum.inaturalist.org/t/whats-the-best-way-to-share-python-code-nowadays/48554
@kildor has a page that provides another way to export stuff: https://kildor.name/inat/download-observations
i’m sure there are other tools that can help with this, too, but those are the first ones i thought of off the top of my head.