Failure in footer widget

You have broken HTML - check out the errors here: https://validator.w3.org/nu/?doc=https%3A%2F%2Fhibernocolchoneria.com%2Ftienda%2F

I'm assuming the error is in your sidebar - likely a widget that is specific to the store.

Make sure every opening element has a closing element.

You were right. I discovered that the problem is with the form I had in the sidebar. For some reason, when you put a contact form there, sea as the sea, gives that failure. I have tried another topic and it does not give that problem. What can I do to put a contact form in the sidebar without that flaw?

Is the contact form from a plugin?

If so you will need to contact their support, or choose a different plugin.

The plugin is "Gravityforms". And I have the latest version. With other themes does not give any fault, only with yours. I understand that I can try to use another one but that forces me to use two plugins for the same thing. At the moment I have removed it but I would like to have the possibility to use this plugin with your theme without this failure.

Ok so Tom suggested that there is broken HTML.

Did you add anything in the contact form that could result in the broken HTML?

No, only the own widget that brings gravity to insert your form wherever you want. But I've done it with the shorcode and the same thing happens.

The error might still exist, but might not affect the layout in another theme like it does in GP.

When you re-add the widget and activate a Twenty-something theme, does the error (not warnings) show up when you run this check?: https://validator.w3.org/nu/?doc=https%3A%2F%2Fhibernocolchoneria.com%2Ftienda%2F