URL/Slug issue

Dear support,
One of my website has 2 languages, English and Bangla.
Bangla is the primary language.
But I have an issue in URL/Slug.
See this URL: https://polarbd.com/bn/product/caramel-touch/
You will see both languages version information is showing in one page.
Its collapsing.
See this URL: https://polarbd.com/bn/product/%e0%a6%b8%e0%a6%b0-%e0%a6%ae%e0%a6%be%e0%a6%b2%e0%a6%be%e0%a6%87/
Its collapsing.
It should be like this: https://polarbd.com/bn/product/%e0%a6%b0%e0%a7%8b%e0%a6%ac%e0%a6%be%e0%a6%b8%e0%a7%8d%e0%a6%a4%e0%a7%8b-%e0%a6%b8%e0%a6%b2%e0%a7%8d%e0%a6%9f%e0%a7%87%e0%a6%a1-%e0%a6%95%e0%a7%8d%e0%a6%af%e0%a6%be%e0%a6%b0%e0%a6%be%e0%a6%ae/
One language should show in single product page.

How to fix it?

Thanks.