Here is the non working website info you asked for: Plugin version: 2.20.2, PHP: 7.0.33, WordPress: 5.2.1, MySQL: 5.6.43, WP Memory Limit: 256M
and here is the site it works with: Plugin version: 2.20.2, PHP: 5.6.30, WordPress: 5.2.1, MySQL: 5.6.41, WP Memory Limit: 40M
I have set up debugging now
