Sternsbergerm, I finally got it working today with the latest version.
I disabled object caching and json acf local, then disabled each groups.
After I enabled them again, duplicates disappeared.
I finally put back the json local and the object cache and saved each group again.
This is more like a trial/error process rather than a secret recipe but it ended up working.
The cog icon linking to the group field settings still appears twice though.
Something done in the 5.3.3, seems to have a issue either with local json or object caching. Not really sure why.
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