I have experienced the exact same thing multiple times when not quite fully coming to a stop and then attempting to accelerate again. If I come to a complete stop it is much better.... but there are cases where this can be a surprise (pulling into driveway and waiting for garage to open, yield sign, entering a busy roundabout, slow stop and go traffic, etc) where a complete stop isn't always going to happen. This is not the same as the Auto Hold feature or anything with the Turbo (engine isn't even running) as others suggested above.
What it feels like to me is happening is that the electric motor is being used to help brake the vehicle for regeneration to charge the battery, but it doesn't switch back to having the electric motor power the vehicle quickly enough, it is still trying to regen even though your foot is no longer on the brake pedal. When you do come to a complete stop it seems to leave the regen right away and switches over to being ready to power the vehicle even before you lift off the brake (you can slightly tell when it switches over) so it is ready. My other vehicle is a Chevy Volt, and this equivalent scenario feels much more natural how it switches between regenerating with the electric motor vs powering the car with it, and it happens immediately.
So far (1600 miles in 2 months) this is the main downside I have seen to the Sportage Hybrid (this and the loud reverse sound) otherwise I love it. I was hoping this was something they could fix with an update, but not sure. In some ways it is nice to know it isn't just me, since I don't think I will even ask the dealer to look at the concern.
