I have a huge form with multiple cloneable fields. The form work fine when I'm not using ajax, but when I enable ajax the form does not submit correctly. When submitted the confirmation text only says "undefined", and the data is not recorded in WordPress.
Please update the new version of MB AIO to v1.11.6 or MB Frontend Submission to v2.2.1 then check the problem again. Also, if you want a field that is required, please use the Validation module https://docs.metabox.io/validation/ to work with Ajax setting.
Now I'm seeing that this form is not working with or without AJAX. I do not have any required fields. I'm running the newest version. The form works if I'm logged in to WordPress. The form does not work when I use a private window. Here is my code: https://pastebin.com/WsS2cAg3