I'm driving an automatic car right now, and when I'm driving the manumatic mode for fun, it feels smooth when gearing up or down.

But when I'm at 2nd gear and I'm slowing down (it will automatically shift down to 1)
but when it gears down to 1 it has a rough bump feeling.

It's fine with all the other gears going up and down, just 2nd gear going to one, it's a rough sensation that seems like it's not suppose to happen.

I have the 30 day warranty from carmax still, so I was wondering what I should tell them.

Should I worry?