Reply To: Attribute images for some product is not showing

The problem is that this option is not translated and on En version it takes attribute from DE. You need to edit the file wpml-config.xml first and add the line as shown on the screenshot http://prntscr.com/pbaxwk

<key name="grid_swatches_attribute" />

Then you need to go to WPML -> String Translations and find this option. Translate that attribute slug for EN version and it should work.