This thread is resolved. Here is a description of the problem and solution.
Problem: I am trying to translate hero slider on home
Solution: In this case it seems that the strings were registered in the wrong language, for instance: the string "LAS COSAS QUE HACEMOS" was registered in English instead of Spanish. You can see this issue in WPML -> String Translation.
To fix this problem I recommend you to follow this steps to change the original language of the strings: https://wpml.org/documentation/getting-started-guide/string-translation/#original-language-of-strings and then translate the strings.
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