You're misinterpreting the build number for the "public facing" version number. 9.0.122.X (where X is any number from 0 and higher) is 9.4.

In fact, if memory serves me right, that's an update past the 9.0.128.x version that Maemo 5 PR1.2 had. You have 9.4 still, the build number happens to be 9.0.227.0 in PR1.3.

Hope that makes sense. Just like how Flash Player 10.1 is actually 10.1.xxx.x and 10.2.xxx.x (beta) inclusive.