The Cards Validator is not support to look like that, so I think you have a browser or network issue loading the page.
I just tried: http://www.swashconvergence.com/
INFO: Page fetched successfully
INFO: 19 metatags were found
INFO: twitter:card = summary_large_image tag found
ERROR: Required meta tag missing (twitter:text:description)
WARN: this card is redirected to https://www.swashconvergence.com/
Your page needs a
twitter:description tag populated.
I tried: http://www.aparna.edu.in/
This is working perfectly.