Debut Theme - Check Out page Customisation was not updated

[lawrence_choo]

Hi Shopify users,

I had my check out customisation edited as follows, I've changed the "Shipping Address" to "Your Contact Details (Please indicate your Name & Contact Number) (Indicate "nil" for Address, City & Postal Code)"

However in my current live check out page, the "Shipping Address" is still as "Shipping Address"

Appreciate any guidance on why the customization was not done? 
I've edited this before in the past and it work but just recently i found the customization was restore to default.