Slider doesn't validate

Hello,

I am having validation issues after adding post slides to the page. It throws up 10 errors on the page.

See: https://validator.w3.org/check?uri=http%3A%2F%2Fwww.footfallscaninephysio.co.uk%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

Can you please give advice on how it may be possible to overcome this?

The plugin is being used here: https://www.footfallscaninephysio.co.uk/

Cheers!

https://www.ads-software.com/plugins/post-slides/