SiteOrigin image bad value

On the site i have 9 SiteOrigin Images. Validating w3.org it gives the error
Error: Bad value for attribute srcset on element img: Must contain one or more image candidate strings.
Syntax of image candidate strings:
A comma-separated list of strings, each of which consists of a URL optionally followed by either a pixel density descriptor or a width descriptor.

Also if I use the title with title position below :

Heading cannot be a child of another heading.
From line 281, column 28; to line 281, column 31
t-title”> steen

showing the weaver xtreme template for h2.

↩
↩
↩
steen ↩

Kunst van Petra Open Atelier aan de Merk in Workum

For now all the titles to hidden and use the text-widget.

Is there something wrong with the widget??

King regards