Hi @vicskf
That’s weird. Did you use the Local JSON feature? If you did, could you please sync the field groups? This page should give you more idea about it: https://www.advancedcustomfields.com/resources/synchronized-json/. If that doesn’t work, could you please backup and delete the Local JSON folder?
If you didn’t use the Local JSON feature, did you use a cache plugin? Could you please clear the cache and see if it fixes the issue?
Thanks 🙂