grubs,
The ClearOS Serviio "webconfig-app" is just a shell to start/stop and control Serviio in the ClearOS environment. Since there is no API-change in Serviio 2.x from the 1.x versions, this shell did not need any update, so it is still version 1.8 (its versioning is not really connected to serviio releases).

So everything is as it is meant to be.

/Fred