Pagination problem

I’m using the wp_pagenavi plugin and for some reason every time I click to go on another page it takes me back to my homepage.

I have a custom homepage and I am displaying all posts on a page called “Blog”

Any help would be appreciated.

<?php get_header(); ?>

	<div class="container group">

<?php get_sidebar();?>

		<?php if (have_posts()) : ?>
		<?php $temp = $wp_query; $wp_query= null; $wp_query = new WP_Query('posts_per_page=8&paged=' . $paged); while ($wp_query->have_posts()) : $wp_query->the_post();?>

			<?php include('loop.php'); ?>

		<?php wp_pagenavi(); ?>
		<?php endwhile; $wp_query = null; $wp_query = $temp; ?>
		<?php else : ?>
		<?php endif; ?>

	</div><!--/.container-->

<?php get_footer(); ?>