Hey @Innovatek,
According to the WordPress WP Query documentation at https://codex.wordpress.org/Class_Reference/WP_Query, the
posts_per_page (int) - number of post to show per page (available since Version 2.1, replaced showposts parameter). Use ‘posts_per_page’=>-1 to show all posts (the ‘offset’ parameter is ignored with a -1 value). Set the ‘paged’ parameter if pagination is off after using this parameter. Note: if the query is in a feed, wordpress overwrites this parameter with the stored ‘posts_per_rss’ option. To reimpose the limit, try using the ‘post_limits’ filter, or filter ‘pre_option_posts_per_rss’ and return -1
offset (int) - number of post to displace or pass over. Warning: Setting the offset parameter overrides/ignores the paged parameter and breaks pagination (Click here for a workaround). The ‘offset’ parameter is ignored when ‘posts_per_page’=>-1 (show all posts) is used.
There is currently no way to use pagination including AJAX pagination without problems. You will need to use “Load All Posts” or manually exclude posts.
Thanks.