WPML · Customize design

There is a problem with the coupon text translation.
Our webpage is English and Spanish.
When I try to translate the text via > Customize, it’s always changing one text,
does not differentiate Spanish from English.
I mean, I write it in English. then I and when I access to Personalizar (Customize in Spanish) and write it in Spanish. If I return to English, the text is in Spanish.