Thank you both for your replies and help it is appreciated.
I was testing with our own site as we are new to twitter cards in order to solve an issue on a clients site
It is a wordpress site and we have set the cards up using the social settings in seo yoast. The cards work and display fine in the validator for all pages except the home page. On checking the source as in the troubleshooting guide the home page is missing the correct tags that appear on the page sources for the other pages.
I am unsure why it works on all pages except the home page.
Is it possible you could help us have the card appear for the home page as well as the others please?
The home page is here: https://www.frescoenvironmental.com/
Any advice on adding the tags manually for this page would be appreciated if required.
Thanks again for your help.