Jimmy Nardello heat level?

[SacFly]

I'm trying this for the first time this year. I started seeds from a reputable commercial source. These were the only peppers I started from seed this year, so no mixup on my end.

I was expecting a sweet pepper, but what I've picked so far is closer to a jalepeno than a bell. There is a distinct burst of heat, kind of cayanne-ish tasting, that disipates quickly. This isn't correct, is it?