Few things are messed up here.
I have one field, called Title. It is a text field. The value of it will not update. It just always keeps the old value. I deleted the field and added it back. No effect.
I have two other ACF field groups, both with a Title text field.
When I updated one it updates the other one. Not the expected behavior, they should be independent.
Things seems corrupt.
Thanks
You cannot have multiple fields with the same name used on the same WP object (post, term, user, etc). Fields used on the same object must have unique names.