You could try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Then make sure you have the following versions as required by wordpress
PHP version 7.3 or greater.
MySQL version 5.6 or greater
If that doesn't help, please provide us your wordpress and ftp login in Secure Note