Looks like fasciation - is a genetic thing where flowers are produced very close and crowded. You can cut out the affected stems and if there isn't much it should be OK. If its low down the rest of the plant might be affected..
Don't think its anything to do with the variety. I saw a dandelion like it once with a flat stem half an inch across and loads of distorted flowers crushed up together at the top. Very odd.

I bought a tomato plant , cherry tomato and it looks exactly the same!

If it was like that when you bought it I'd take it back Colter.
check first that it isn't some sort of aphid scrunching hte leaves up though.

Thanks guys, friend gave me a couple of the same seeds and I have the same result on one of the plants that grew.