Hi @sophiet
Thank you for the information.
The PHP values are fine.
I am wondering if the issue is related to the Litespeed server, I see the Ajax request still return not found 404 error.
Please, take the following tests:
– Create a staging website using this plugin https://www.ads-software.com/plugins/wp-staging/ It will create a copy of your website
– Check if the issue persists, also resave the permalinks once again
– If the problem persists run a Full plugin and theme conflict test following this workflow: https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif
But if the issue persists please, contact your hosting support to verify the LiteSpeed configuration.
As a temporary solution in the live site, you can try to use the Page reload instead of Ajax:
https://monosnap.com/file/9hGOydW5sbiWnmWVwJV6qulwbN7z4q
Let us know the result you got.
Best Regards
Patrick Freitas