You have to remember that they have thousands of tables running at one time.
Right now it's 11:15 am on a Saturday morning and there are 3500 active tables going.
With that many hands running, multiple pocket pairs/suck-outs happen simply because of the odds
in that many hands.
Most of the hands play out as they "should". I think if you play PS and kept track of how many times certain longshots come through and ALSO kept track of how many times what was "supposed" to happen a large % of the time according to odds actually happened.
You will find that the math gets upheld at the end, even though it might not seem like it. Players tend to forget their bad beats more than their wins with certain hands.