Increasing pressure in kegerator

I've done a little searching but haven't found anything like this yet...

I'm a newb to kegging. I bought a kegerator last weekend in San Diego and while I was down there I picked up a 1/6 keg of Stone's Pale Ale. I put the keg along with the CO2 tank in the kegerator overnight to let it cool down to about 38 F before tapping it. After hooking up all the hoses and tapping the keg, I set the regulator at 10 psi. Later on I checked it and the pressure had gone waaaay up to about 50 or so. I purged the keg, checked all my connections, and set the flow dial as low as it would go. About an hour later I checked it and the pressure went way up again.
When I first tapped the keg there was a lot of foam, but after some time and a few more pours the head went down to about 1/2".
Does anyone know what's going on here? My kegerator can hold up to 3 corny's but for the time being I have no homebrew kegged and figured for aesthetic reasons I'd leave the CO2 tank in the fridge. Any advice would be greatly appreciated.

With mine, I turn it down to 5 and then turn it up to 12.

Congrats on the new kegerator!

It is possible that the keg is degassing a bit and boosting the pressure. I'd shut the CO2 off and tap a few pints, then turn the CO2 back on. A check valve in the line would prevent this from happening, but many regulators do not have one.

I'm pretty sure commercial kegs aren't gassed up to 50psi
I would definitely suspect the regulator...

Cheers!

Came home from work yesterday and the pressure was almost up to 50 again. I decided to shut off the gas and purge the keg. Seems like the beer is now way over carbonated cause a put just comes out completely foamy. Unfortunately the place where I bought the kegerator/regulator isn't open on Sunday, so I'll give them a call tomorrow. In the meantime, thanks for all the advice.

Called customer service today and they said it sounds like a creeping regulator. They're going to send a replacement. Hopefully that fixes it

So I received the replacement regulator the other day after the place I bought it at found it defective. I hooked it up to my tank, turned the gas on, and poured a glass...still all foam! The keg had not been hooked up to any CO2 for a week, and everyday I would release the pressure in the keg that was left over. So how come my keg is still overcarbed? And how do I get it back to normal? Please help because I'm a new owner of a kegerator and instead of pride I'm feeling regret.