Text before ‘read more’ tag appears only in original language

Hi, the plug-in works great on everything, is just that in this kind of page: https://omali.ketzalstudios.com/en/productos/geomembranas/ the preview text of the products keeps showing the spanish version and not the english one.

If i remove the ‘read more’ tag from the spanish version, then the english version appears fine, but the spanish version displays the entire article, as it should, but is not what we need.

I don’t know id i’m explaining myself correctly? thanks for your support.