Here and at https://wordpress.org/support/topic/google-is-showing-post-from-homepage-how-to-solve-it so it appears there is nothing wrong with finding your post twice since you posted it twice.
Your site rank is not going to be in say the top 100 so I'd not worry about that.
Your site also has items that moderators remove from this forum as spam. That doesn't help your rank at all. You may want to think about cleaning your site of the usual spam posts.
I am in great problem. Google is showing any particular for post twice .
For example I Searched in google about "walton gh6 techzonebd"
And search result showing two result with the relevant keyword.
One is the post I wrote and other is from the homepage or front page.
Google shows Like that
Google Search
walton gh6 techzonebd
About 24 results (0.69 seconds)
Search Results
walton-primo-gh6-specifications-full-review - TechZoneBd ...
http://www.techzonebd.com › Android Phones
Apr 3, 2016 - Walton is going to release another good budget handset. It is walton GH6.It has many features like it has ips dislay with 16M Colors, Its back ...
You've visited this page 4 times. Last visit: 4/9/16
TechZoneBd - Bangla Tips, Tricks & Tech Reviews
http://www.techzonebd.com › Blog
Assalamualaikum The post is about Walton's upcoming latest Android set Walton Primo GH6. Walton is going to release another good budget handset.
You've visited this page many times. Last visit: 4/10/16
This problem is happen in every post.
I have a question about That will it affect my site ranking ?
Is it a duplicate content ?
I want to solve the problem . I want to show only the post i worte on google search.
Plz help me.
My site http://www.techzonebd.com

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic