I have checked with W3C (Markup Validation Service) a new website developed with Blocs (https://www.mlselche.es) and it gives me the errors that appear in the image below.
I believe that the two modules that appear in the image are inserted in the code by BLOCS.
Could you confirm if it’s Blocs or is it that I’ve missed something?
How could I fix it?
Very grateful in advance for your attention.