It may be that there is nothing wrong at all.
I can see a beer tasting too bitter just from the freshness aspect. Your average beer drinker is unused to how a beer tastes at 1,2,3 and 4 weeks out even, and perception of an acutely amplified hop character such as bitterness and/or flavor can be surprising and even unwelcome.
The good news is that hop bitterness fades and mellows fairly quickly and our personal taste changes as well.