[Закрытые] xliff importing in 2 different languages problem

Background of the issue:
Hi,
I've export all my pages, menu, model, header, footer made with elementor pro in xliff files to translate it by pro translater in Dutch and English;
I receive the files translated back, and so, I import the 3 zip files in Dutch first, and then the 3 zip files in English.
Problem is:
The import in Dutch was succesfull and with the View link to verify page it was ok.
Then I import in English and all the pages, menu are now translated in English, Dutch inclueded.
And to synchronise menu, all is only in English and Dutch menu is translate in English...
How can I resolve this bug?
Made I a mistake when importing files?
Thank you

Symptoms:
first language imported xliff files are replaced by the last language xliff files imported

Questions:
how can I resolve this problem?