I am using your plugin WPML and also pixel your site.
I have a problem in my translated languages,
That my pixel cant track the visits to the products in translated languages.
The pixel is working correctly with my main language (English),
but the problem happens only in translated languages.
I Have added you 2 screenshots so you will better understand my problem
Can you perhaps search on what "Retargeting ads can’t run for 1 out of 1 product views on this page, because the products people have viewed are missing from your catalogs" message means in fact, what is it related to?
Can you ask the plugin support perhaps, as it may give us more ideas on what to for here?
There is this option in WPML:
WPML -> languages -> Language filtering for AJAX operations -> "Store a language cookie to support language filtering for AJAX ", so perhaps you could activate this, but I'm not sure if this will help.