problem about redirect mistake

[olwyh04]

Hey guys, I got a problem about redirect mistake. My website have two language, English and Chinese. But when I use Chinese site it's seem everything is okay, but it was redirect into the English site when I click into product detail page. I didn't set any redirects, and it's work before, it's just suddenly happen in these days. I don't know where's the problem. Thank you.

Here's my website:
dans-le-gris.myshopify.com