Will offer my way of fixing.. probably something went wrong in the themes, aside from css, probably version mismatches with the core nodebb version your using. The below will revert to working vanilla and lavender theme versions that match w/ your core nodebb install version. (probably need to stick with whatever theme versions it reinstalls, because I've always had problems w/ updating themes, I don't upgrade them anymore) Stick with what came with the nodebb install originally. This will revert back to originals:
ahwayakchih already signed NodeBB Individual Contributor Assignment Agreement so hopefully by the end of the month we will try to migrate from IP.Board to NodeBB. We're moving it from old server to the new one so all other things have to be updated.
We're waiting for NodeBB 0.7 to be released and for UTF8 Converter in already great nodebb-plugin-import tool.