plugin is not compatible with theme atlier

I have purchased your plugin for my client’s website (https://www.webshop.fuglsang.dk/). Search works superb, And i am really happy about it. But the plugin is not really compatible with our theme Atlier (https://themeforest.net/item/atelier-creative-multipurpose-ecommerce-theme/11118909) . When we type some thing on the search box and scrolls down the page, a new gap between header and search box appears. Can you please let me know how i can overcome this issue?

Screen shot link : https://gofile.me/6lYKv/iMebh9tec

https://www.ads-software.com/plugins/instantsearch-for-woocommerce/