When someone has enabled the Browser language redirect in WPML must also complete the Preserve url parameters field.
Where is the problem?
if you add a Facebook campaign with this tracking url
https://domain.gr/?utm_source=source&utm_medium=medium&utm_campaign=onoma
and your browser for example is in GR lang then wpml will redirect the link to
https://domain.gr/el/
without keeping the url parameters! This propably will cause issues in tracking .
Solution
You must add in the Preserve url parameters field what wpml should keep
