OK the Lazy Loading Images are now working correctly.
And now you have a completely different issue.
See here:
https://www.screencast.com/t/wVMOnGqY
This the Film Strip created by Google Page Speed Insights.
I have marked the frames in Green – which are the first two where the lazy loaded featured image is correct
The red frames are when an Advert is inserted above the content which is creating a huge CLS issue.
I would suggests NOT loading adverts above the fold to fix this problem.