This was a pretty simple mistake but it took me a while to figure out. We were noticing everything on the domain was 10 minutes behind other devices we used and in troubleshooting, I configured my PDC emulator to sync with pool.ntp.org using NTP, and it did, and seconds after, the time would revert back.
Of course, the issue here was that the DC was virtualized and Hyper-V time synchronization was taking preference and syncing to the Hyper-V server's local time which had fallen out of sync. The fix here was either disabling time synchronization on my DC, or enabling NTP pool synchronization for my Hyper-V server. I chose the latter, and moments later all machines were the correct time.
Credit where credit is due:
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