A vantage station, power interruption, web pages generated with data that does not change - sounds a lot like a Vantage station with corrupted station memory. Not sure if that affects a Wifilogger (as well as the Davis loggers). In any case the corrupt station memory troubleshooting steps (
https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#weewx-generates-html-pages-but-it-does-not-update-them) might help. The real answer will be in a log.
Not likely to be a SteelSeries problem, that would just impact the SteelSeries gauges and doesn't really tie in with the OPs words 'the files in the html directory are being replaced however they are the exact same image as were created at last weeks failure point'.
R