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Super weird behaviour… 🙁
I added a new custom field, and move it to the top of the list in the field group.
When doing so, all field names changed to this weird json:
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Then I’ve tried to change the fields names, and it is not saving the value. When reload, it has the same weird json value.
What the heck is this?
Did I loose all my fields names?

Changing field names is not working 🙁 neither wp admin edit screen nor updating manually in database. Any clue on this?
Something’s broken – contact ACF support. Are you using any “ACF add on”-type plugins? Maybe they’re inteferring.