Same problem. Took me a while to figure it out, then when googling with the plugin version numbers, I found this post.
Tried disabling functionality in JetPack, which did not resolve the issue.
Tried installing the plugin “Module Control for Jetpack” by RavanH, where I disabled everything, this also did not resolve the issue
Tried disconnecting JetPack from a www.remarpro.com account. When JetPack is not connected to a www.remarpro.com account ACF seems to work. I can add fields to field groups that is. Of course not having JetPack connected is another problem itself.
