Eventually, I managed to have the style working in both language.

I can not promise this would solve it for you, nor that it’s a definitive fix, but here is waht I did =
– Export my settings for enfold-child
– Activate enfold (parent)
– Import my settings – at this point, the secondary language is still not loading the dynamic_avia css
– Update the homepage in the secondary language – fomr some reason( caching ?), the secondary language now loads the dynamic_avia
– Activate enfold-child – the secondary language now loads an empty dynamic_avia/enfold-child-XX.css (XX being the language code)
– Edit the theme settings in the secondary language (and save them) – Now the dynamic_avia/enfold-child-XX.css is correct

It still seems that there is a bug with the multilingual settings of the theme, but apparently, a workaround is possible.

I have a similar problem.

I have two language set : English and French.

Only the default language is displayed correctly. The other one use different colors for the header.

Checking the souce, I see a possible source for the difference in layout :
– Main language uses enfold-child (the activated theme)
– Secondary language use enfold (the parent)