Excerpt Quick Edit option not working/saving in 'post list'

Hello!

I run https://explorebuxtonderbyshire.co.uk/ and the excerpt will no longer allow me to either edit or add new excerpts to posts on the ‘quick edit’ option. It will only allow me to do once ive clicked into each individual post – which is much more time consuming. The quick edit option is great to add the excerpts when i go the entire list of posts and i can do lots in a short space of time – alas – no more. When i do try and edd text in the quick edit option it just totally disappears and any changes made to new ones – the changes are lost. Can you help please? This has become a key feature of my site so would ideally like this fixed…thanks in advance!
Jen ??

https://www.ads-software.com/plugins/custom-bulkquick-edit/