Well, it was a weird issue...
After tinkering around a bit, I decided to dive in and watch the debug logs for nginx to see if I could glean any info from that. Set nginx up for debugging, started a tail on nginx's error.log...and I was able to access the server using nginx. Not on my computer or tablet, but my phone.
After that, I cleared my desktop's browser cache of references to calibre, restarted the network manager, restarted my tablet, and now everything is working on all three devices it seems.
Honestly, I am not 100% sure what made it work.
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