Presence of external non-removable image codes within the enfold theme

Hi, I installed the enfold theme in the “Enfold construction demo” variant.
In several pages there are references to non-existent images that refer to external links and I cannot remove them.

screenshot 1 https://www.dropbox.com/s/tnq2ju8qh673jio/screenshot-1.jpg?dl=0
screenshot 2 https://www.dropbox.com/s/oxzsu9fr7ixa3mg/screenshot-2.jpg?dl=0

Here codes of external links, repeated several times.

[av_image src='https://test.kriesi.at/construction/wp-content/uploads/sites/7/2015/10/construction-site-machines-845x321.jpg' attachment='80' attachment_size='entry_with_sidebar' align='center' styling='no-styling' hover='' link='page,135' target='' caption='' font_size='' appearance='' overlay_opacity='0.4' overlay_color='#000000' overlay_text_color='#ffffff' animation='no-animation' av_uid='av-yea3n'][/av_image]

How can I solve the problem?

Thanks in advance