Exactly same problem here. Reverting to 188.8.131.52 worked for me, too (big thx to @mdorchain).
What I did was updating the system from 4.2.7. to 4.4.2 (haven’t checked if this caused the problem), then immediately updated all plugins (including ACF PRO) to the newest version. Like for most of my projects I’m using WP Multisite (but in this case ACF PRO is used in the primary instance).
Other field groups in other CPTs are NOT shown twice.
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