My login page after a while it will be changed back to English as before

I’m very confused. My login page, I tried to enter information in Thai, but when I press save, after a while it will be changed back to English as before.

How to fix it?

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Hello,

Now I have checked your site and it is showing in “Thai” language.
See Screenshot for clarification: https://ibb.co/GQQpTMxd

Best Regards,

[Author]

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