I’m seeing something similar.
Tried to upgrade but the Adsense plugin broke the upgrade, so after removing it from app.yaml, I did
./launcher rebuild app
Admin page then said that I was on v1.3.0.beta7 +102 and that beta8 was available. Clicking on the upgrade link took me to a page saying that everything was up to date.
A while later I got another upgrade notification and the upgrade ran successfully via the webpage, and I’m now running v1.3.0.beta7 +103 and it still says beta8 is available and I’m not on the latest version?