Generally it doesn't happen, but you can check with Meta Tag 'Syntex', may b there is any error.
another reason can be, that meta tag has just been created and will be indexed soon.
another reason, webmaster has deliberately instructed to not to show that latest cached screen shot by using:
Besides, The description snippet that Google picks to show in SERPs would the mis of various chunks of text from the page, which include the search terms. If the page meta description fits exactly the search terms, then it may be used as is. Otherwise Google can check other important areas/keywords/section in website, like bold keywords, H1 tags, etc.
Please Note: The description meta tag is not only used for indexing and ranking purposes, it also serves as AD Copy to your visitors in SERPsSo, the Google will pick the most appropriate content only. Hope it answers you query properly 