So, related to this, I have just discovered while working on my current project that cloned flexible content fields to not work, I’m not seeing validations errors, but none of the entered values get saved. This may be related to what you are seeing.
Also, radio fields inside of flexible content fields that have been cloned, that’s even more complicated. The duplicated radio fields end up acting line one big radio button field instead of individual fields and this can cause validation issues. This is a known issue. I was able to work around this issue by setting the display of the cloned fields to “Group”.
It seems that the clone field still has a few technical problems that need to be worked out. You should report these bugs by opening a new support ticket https://support.advancedcustomfields.com/new-ticket/
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