I wouldn't worry about it, I've installed other wallets that said were "version Y" but still showed the old "version X" name, sometimes this just slips through the net.
You could put in a bug report in the 'issue' section of the Github, that would be the quickest way to get it fixed,
https://github.com/sumoprojects/SumoGUIWallet/issues Yeah, no need to worry too much about it. Report them to devs and they will fix soon.