Thank you for your reply.
>Do you have the same problem with previous version?
I have not had any problem before 1.2.1. As you advised, I tried 1.1.9.zip and it solved the problem! Thank you very much.
>Please also let me know url of your site
URL is like following; https://riskhedgehog.com/
I will try not to update until the problem gets elucidated.
Thank you very much for your support. It really helps!