PLs Help me with this Code

Hello,

I am making a code to show the result of an upcoming election result.
I just a beginner in php and wordpress and made using this tutorial
https://www.deluxeblogtips.com/2010/04/how-to-create-meta-box-wordpress-post.html

The Problem with this is that it will save only the first field only. The Remaining Field will not be saved.

https://wordpress.pastebin.com/LqsXQRDb Here is the Code