I hope you are well today and thank you for your question.
I visited your website and It seems you are using an older version of the theme on your website so please update it to the below latest version as described here https://support.shufflehound.com/updating-theme/
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Please clear your website and browser cache after updating the theme so that the latest js and CSS files will be loaded.
Also, please try regenerating thumbnails on your site using the below plugin.