The save is redirect back to the index page of backend. This typically means you're hitting max_input_vars limit. Looks like max_input_vars is set to a limit of 1000, but your form POST is hitting over 1300 due to many select options added to the field. You'll need to adjust php.ini and set max_input_vars to something like 3000 to get rid of the issue. if unsure how please contact your host as they should be able to help you do this.
Kyle (Krileon)
Community Builder Team Member
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