Hi there,

Thanks for contacting us. Sorry for the inconvenience. Will you please provide me the Joomla administrator access to check the issue? I will check & get back to you soon. 

-Thanks

just uploaded on hidden content

Please downgrade your PHP 8 to 7.4 and let me know. Thanks

just did!

Will you please provide me a backup of your site via google drive?

Follow the video instruction to make akeeba backup

https://drive.google.com/file/d/1HwEmKAzw-uVWQHdASGHU31nJaJKBSR56/view

https://prnt.sc/nNkUAC_LCXjH

Export your database and make an zip file of your site. Then upload into the google drive. Thanks

link on hidden content. please wait 20 minutes so it can finish uploading

for some reason, Drive is not working. new link now

I think this problem comes from your Joomla files or database. Cause, I have checked Joomla article action and same problem occurred there. Thanks

I tried to "Reinstall Joomla Core Files" and "Update database structures". Do you have any suggestion?

I tried different ways. But, No solution found. Thanks