When you try to create a second release with the same package version, Octopus increments the build number by one for the release version. When you create a newer package, Octopus still uses the incremented version which is not cool. Take a look at the attachment.
Thanks for the mail. This is coming in Octopus 2.4, which should be available in preview soon. https://github.com/OctopusDeploy/Issues/issues/514
2.4.1-pre is out now with this improvement.