Raw code (placeholders) showing on frontend after change from previous theme

Im trying to view another theme live with the live preview but I get so many raw code on the home page, example of code below

[td_block_trending_now sort=”random_posts”][td_block_big_grid_3 category_id=”11″]
[td_block_2 custom_title=”NEWS” header_color=”#4caf50″ category_id=”11″ limit=”6″ ajax_pagination=”next_prev”][td_block_1 custom_title=”LATEST” header_color=”#e29c04″ category_id=”18″ ajax_pagination=”next_prev”][td_block_15 custom_title=”BUSINESS” header_color=”#607d8b” post_ids=”BUSINESS” category_id=”2″ limit=”3″ ajax_pagination=”next_prev”][td_block_1 custom_title=”SPORT” header_color=”#f44336″ category_id=”15″ ajax_pagination=”next_prev”]

but on the current theme, I dont get this error at all