Why are some rollover images not displayed?
In pages that list products, such as "category" pages for example, some themes (or modules) allow a second image of the product to appear when hovering over it. However, as this functionality is not native, it is not made to work with the product variant splitting functionality implemented by our module. In other words, the theme/module that implements this effect does not take into account the displayed variant. This means that you will only see the second image appear on some displayed variants and not on others.
For this effect to appear on all displayed combinations, you must ask the editor of your theme (or the editor of the concerned module) to take into account the attribute, and more precisely the "id_product_attribute" used by our module.