PokerPro uses a normal 52 card deck that is automatically shuffled before each hand by a GLI-certified Random Number Generator (RNG). For the duration of the hand, the deck stays as it was dealt. Each card has the equal probability for each hand. In fact, cards are burned, just like in traditional poker.
Please note players see 50%~75% more hands than on normal poker tables so you are bound to see more big hands, especially in a full-ring poker game.