Shopify & Inventory Integration - Item fields are deleting

Shopify & Inventory Integration - Item fields are deleting

We are trying to integrate a shopify store with our Zoho Inventory. We have noticed that once we turned on the sync, our item fields were getting deleted. eg, Product category, Manufacturer, Brand, + all our custom fields. We have now lost all our Item Field data & do not wish to import the back up data if it will continue to delete. Wondering if any one else has come across this issue? Hoping someone can assist us with the field mapping to prevent it overriding and deleting!