Hi Invikta,
I wonder if this is happening only for the title option. Please try to change the content section and see if it changes in the front end of the website.
If it is not changing even regarding the content section then the issue must be the cache. Please purge any kind of cache that you might have on your installation it can be a plugin in the WordPress dashboard or a cache system on your server which you need to follow up with your hosting service provider, and finally, try to clear your browser cache.
The other point that comes to mind is if you use the WPML plugin for the translation of the website to Japanese. If that is the case please check if you set the plugin correctly as below:
kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case if you still have problems.
Thank you.