Photoswipe masonry not compatible with Shoestrap theme

Hi – it seems that shoestrap and photostripe masonry are not compatible – if I use Twenty16 the masonry works on the gallery page but not for shoestrap – is there anything I can do about it? website is http://wanakaweddingmakeup.co.nz/Gemma/gallery/

https://wordpress.org/plugins/photoswipe-masonry/