What version of ACF are you using? I just did a test and when I include a wysiwyg field in acf_form() that is a sub field of a repeater and the content added in the back end is shown in the front end.
Or it may be because you’re trying to show the form in the loop that’s getting the field keys. Try storing all the field keys in an array and then use a single acf_form() call to display all of the fields.
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