Problem with translation data disappearing

The newly created translation data has been lost.
I use two languages,
Initially, a language variable was created and added to both languages.
I checked because one language language missing in storefront and one of the two languages had variables and the other did not.
I’m curious why this happens and how to fix it.

How many store-fronts do you have?

Thank you for your reply
As of now, there is only 1 storefront.