Fields disappear from front-end after "recovering"

I tried to use this plugin on WordPress 4.9.8 and ACF Pro 5.7.7 and it didn't work how I hoped.  I was able to bring up the fields in the admin panel but it didn't work to edit the fields and I actually lost all the fields in the front end.  I had to create new fields manually in the PHP and would still like to use this to recover what the previous developer imported.