Looking in past Forums entries, similar power badge glitches seem to occur once in a while:
Unfortunately, from the responses given in those, it would seem that the badges cannot be deleted once they’ve been received.
One logical explanation for this glitch occurring at all, that comes to my mind, is that the badges might be being triggered in game by extremely brief (e.g. microseconds long) falsely-high power readings, whereas the ride stats that we can access in Zwift/Companion might only record power readings that last longer (e.g. milliseconds). That would explain your 274W max, despite getting the 1100W badge, for instance.