I think that when comparing the DOIs of works to decide what to group, you aren't parsing them to be case insensitive using ASCII case folding for comparison of text. https://www.doi.org/doi_handbook/2_Numbering.html#2.4
The doi:10.1002/14651858.CD001730.pub3 is equivalent to doi:10.1002/14651858.cd001730.pub3 but Scopus and CrossRef are using these two different presentations, which then list as separate works in ORCID.
Although in this this case I can create a manual entry with the Scopus ID and the DOI as listed by CrossRef, I shouldn't have to and the Scopus presentation of the DOI is the one preferred by the publisher.
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