A problem with multiple item buying restrictions

[agribz23]

I was contacted by a buyer wanting to purchase multiple items I have listed up, but he says that this strange message came up when he tried to do so; 'The seller only allows for buyers to purchase 1 item every 10 days'. 

How do I go about changing this in my account settings, as i have looked and tried to fix this and have been unable to do so? 

[*casey*]

Go to your Seller Hub

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Your buyers  - Managing who can buy from you  > Edit

Untick  "Block buyers who are currently winning or have bought  x items in the last 10 days"

Click   Save Changes