During our efforts to get the latest upstream-merge working, the package versions (in particular the automatic git revision count) have been set backwards.
As a result, opkg will not see the latest versions as updates to your current version.
You need to reflash, that's the only way to get the version numbers back in sync.
This can happen every once in a while, when something bad happens on our buildserver, and we have to setup a clean build environment.
Use a Back-up solution to help you flashing