DOI not updating

I have manually updated my doi on the Endnote reference to add them in

I then clicked ‘update citations and references’ in my word document.

This has updated 150 of the references.

However, for 4 of them the doi in my word document does not match what i have entered in the Endnote reference database. Instead they have a hyperlink in them. This does not match any of the field entries I have inputted in under URL or any other field.

In any case, I have unticked the box ‘if the DOI field is emply, use’  

Thanks in advance for your help. I am using Endnote x 7.