Having a really weird problem today. We’ve always used static meta tags on HTML pages to create Twitter Cards - they’ve always worked fine. Suddenly today, none of them are rendering on Twitter Card Validator, not even ones which have previously worked (see example URL below). Everytime I try to validate a card, it says only two meta tags have been found and no card has been found, even though they’re clearly in the source code. Twitter Card Validator is even saying pages with no meta tags have two meta tags! Our robots.txt is definitely allowing Twitterbot, and hasn’t changed since yesterday when our Twitter cards were working.
This has happened a couple of times at weekends before, but it’s cleared itself up. Is there a chance it’s something on the server side or Twitter being blocked out of our web host?
Thanks in advance,