How much time elapsed between brewing and kegging?
My "normal" brews (around 60 point OGs) usually don't make it into a keg for at least 4 weeks, usually closer to 5. Then by the time they've carbed up that's another week and a half to two weeks, so total time from pitching to serving averages around 6 weeks. By then they're actually pretty mellow, but they'll still improve a bit before they kick. fwiw, I cold crash to 34°F for four to five days before kegging. Definitely no yeast bite left...