Do not worry. Check the source code of the blog post and look for the canonical meta tag. Google indexed the canonical URL instead of the page you submitted.

Hello I have a big problem with my blog. I updated some of my old blog posts and then submitted the links in Google Search Console. I thought it will help Google to crawl and index the updated posts faster. But, to my shock, google deindexed those pages. What did I do wrong? any help please.