Story not getting AMP validation

I tried to validate the first story I made using the Web Stories plug-in however I received a notification that the html was not valid with the following error:

The attribute ‘value’ may not appear in tag ‘meta’.

I looked at the code it referred to and it seems to be meta elements related to Twitter. However I could find no way to delete these either through the code itself or by using the Web Stories interface.

Could you please help me with this?

The page I need help with: [log in to see the link]