The problem only happen when i add group selector

Hi! i am new here and really like this tool alot
Everything is fine, but i want image data too. Some item have more than 1 image, so i use group to fit all the image url in one colomn. It works in the preview, but when i do scrape, it just skip a lot of item list.

Url : Product | Total Health Gym

Sitemap:
{"_id":"totalfitness-web","startUrl":["http://www.total-healthgym.com/Product.htm","http://www.total-healthgym.com/Product([2-8]).htm"],"selectors":[{"id":"link","type":"SelectorLink","parentSelectors":["_root"],"selector":"a.data_2149_741","multiple":true,"delay":0},{"id":"nama","type":"SelectorText","parentSelectors":["link"],"selector":"h1","multiple":false,"regex":"","delay":0},{"id":"harga","type":"SelectorText","parentSelectors":["link"],"selector":"div.style_2149_93","multiple":false,"regex":"","delay":0},{"id":"spesifikasi","type":"SelectorText","parentSelectors":["link"],"selector":"div.data_2149_449","multiple":false,"regex":"","delay":0},{"id":"kategori","type":"SelectorText","parentSelectors":["link"],"selector":"h2","multiple":false,"regex":"","delay":0},{"id":"gambar","type":"SelectorGroup","parentSelectors":["link"],"selector":"div.lay_598_47 > div","delay":0,"extractAttribute":"data-original"}]}