I think you will need to reach out maintainers of that Repo. They will
probably need to do hard sync from Maven Central to get consistent set
-- by default things are write-once, I think, to prevent accidental
mutation of artifacts. For this admin privileges are likely needed.
But I think they have had to do this occasionally.
The root cause in this case was that due to some issue with Sonatype's
OSS repo, incomplete set got through, and initial fix then pushed
inconsistent checksum files. This did get resolved, but it is likely
that sync by other repos occurred in the meantime.
-+ Tatu +-