Selective ceramic tile in kitchen warm? Question #2?

This is more info on the same question I asked earlier. Thank you all for the help. I just noticed the tiles warm today. I am not sure how long this is going on. Purchased new home in April 2006. It is Aug, so not using heat. Did not use the dryer today. Kinda think that I have plumbing running that direction in my slab. But what is odd is that it is only 4 tiles?? in front of electric stove and a set of cabinets next to it. I have no heated tiles. I had no hot water when I moved in, in the laundry room which is adjacent to this area. I also have a utlitity sink in there. The builder had to cut sheet rock to the adjacent garage and jack up my concrete floor to fix the plumbing for the hot water. I do have a recirculation pump on the hot water heater which stays on. But if plumbing installed in slab is layed out at the same depth throughout, why would just a few tiles be warm. This home is full of poor workmanship. The builder and his yuppies have been deceptive and unfair to me.