Two of mine showed 3.9 as what was available, but once I click the update, 3.10 was actually installed.
I only installed the Meta Box AIO but found out that only one of my sites offering updates to MB AIO 3.10, my other sites don't offer update.
When I tried to manually download the updated version from the Meta Box My Account, it displayed version 3.9 as the latest version (MB AIO download page), but if I click the changelog, it includes the version 3.10 logs (MB AIO 3.9 changelog).
After I manually downloaded the latest version (3.9) from My Account, I had to delete the previous MB AIO plugin, as now I got two AIO installations with the same version 3.10.