Reference in library saved using several languages


I am using EndNote X7.6 Desktop on macOS Mojave 10.14.6 and the language is set to English. 

I am writing a word document (Word 2017) with language set to English (US) as default language. I noticed that suddenly the language in the text would change to Spanish or Dutch. After a while I figured it out that the citation in the text was the problem because the citation reference list was in a different language or even part in English and part in Dutch/Spanish.

The only solution that I found was to select everything in word and changed the language to English (US). However, everytime I update the citation list, the language changes again. 

Any idea how to change the language of the original reference in EndNote?

Thanks for the help in advance!