After some crazy troubleshooting I found what was causing the problem – one row inside the wp_usermeta table. You can see it here to see if you can repro somehow:
https://drive.google.com/open?id=1UlilH4gLS-ldxW04SGlqTHn8RvTn6r3-
Am attaching the sql files:
test_site_working.sql – ACF works w/o problems
usermeta-efd.sql – restore to repro the problem
Username: xhGo4yQE
Password: EUIQSzcpVh5NuV+RZA==