Well, as an expert on RNGs (yes I am. Do not contest my knowledge), I can say there may be a fault with this one.
First of all, I can see that it is a 2-in-1 machine, generating random numbers and then "translating" them into probabilities of impossible things. It is basically a paradox engine as well as an RNG. Now, normal paradox engines require someone generating the numbers. This machine is automatic, as a 2-in-1, it generates them itself. However even paradox engines have accounted for the chance of something normal occurring. The fact that the moment you flipped the switch a shark appeared leads me to believe that this device's probability calculator for possible things has malfunctioned and gives ridiculously low numbers for the normal things.
Unfortunately the only way to determine it is to restart the Engine multiple times. If the same unusual things keep occurring, then and only then we can say we are looking at a malfunction.
Now if I turn the device off, the paradox is going to fade. The device is maintaining the paradox as long as it is on. Turning off the engine will by extension make the shark disappear. But I think we can overcome that by separating the power supply for maintaining and for starting new events. I'll begin the upgrade.
*narrowly avoids shark who is jumping around trying to bite something and starts upgrading the machine*
Someone keep that thing off me, it is hard to work like this...
Also, no one touch the lever until I upgrade it. Not only you may fry off the device, but also, even if you don't, you will make every other paradox fade including the shark.