Alt attributes missing

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Is there anyone to help me out? My store is 
I am doing SEO for my Shopify store. Firstly it shows me that I have you have 59 alt attributes missing. After that, I log in to my store and add alt attributes to each and every image. But when I refresh it and check it again. I found no results. It is showing the same result as the previous one. 

Even though I check through each and every SEO tool and plugin I have. But still, I do not found any result.

Is there anyone expert who can guide me about these alt attributes no implementing them manually?