It's absolutely normal.
If you hit a puddle with 2 tons of car at speed, the surface tension will all-but tear the steering wheel out of your hands as in the direction of the impacting wheel .
As you impact, the water's first reaction is to bunch up tight and this massively increased friction grabs the tyre. Being water, it then falls apart pretty dramatically but since you probably over compensated by reflex, you'll be launched in the opposite direction. The process feels exactly like you've 'lost control' of the steering for a few seconds.
If it's a good long puddle (or you hit it hard/fast), the effect last longer and steering is all but impossible until the tension breaks.
Scary as ****, but great fun if you know what's going to happen and how (not) to react.