pagenavigation not showing the next page just linking back to the main page

Using this on my index.php

<?php if(function_exists('wp_pagenavi')) { wp_pagenavi(); } ?>

Using plugin:

WP-PageNavi Wp
Pagenavi Style

Not sure what information you need to help me fix this. So please let me know.

Site: https://www.slashgeek.net/

code of index.php https://pastebin.com/hThDBcyC