ERPNext integration with shopify

Hello Everyone.
I have integrated my ERP NEXT with shopify which is working well, I want to make unavailable those stock which i don’t wish to be on my online store, that’s quite an easy task right, but whenever i go back to erp sync it with shopify because i have to update a new stock or, i have created a new item for that purpose i have to frequently sync the erp next with shopify but whenever i do this the product which i have previously set them as unavailable on my online store because of out of season now it again shows on online store . I have done this process two three time to ensure the issue.
Please share your thoughts.