No longer saving edits

When editing custom fields in multi-value mode, it doesn’t appear to be saving I click the button to save at the end and re load the page but the same fields I just edited appear blank. I go into the post edit pages to check if they’re saved there but they aren’t.

This plugin used to work and now it doesn’t. Any idea why?

https://www.ads-software.com/plugins/custom-field-bulk-editor/