Docker Version 'Not Available' for all my Custom Container Images

[kodakrome]

For some reason when I build and use a custom docker image (dockerhub), when I click 'check for updates' the version column always goes to 'not available'.
I feel like I'm missing something really basic in how I set up dockerhub or something.  My expectation is that it would compare the hash or something with the current latest and tell me that it was either up to date or that a new version was available.

Thanks for any help.