If the cylinder moves, without a key, from the home position, then the pins
are not being driven into the cylinder. There are either no pins, the pin
shafts are dirty causing the pins to stick in the unlock position, the
itty-bitty springs are missing, or something else.

It's a brand spankin' new lock. I got the feeling that the guy who
was keying it to work with my existing house keys was not well versed
at the process. Thus, I'm guessing he messed something up inside
while keying it.

I'd fill the lock with WD40. Then tap the lock lots with a hammer and work
the key in and out in an attempt to dislodge the stuck pins.

Like a goofball, I didn't keep the receipt and not sure if Home Depot
will let me exchange it, so I'll give your WD40 trick a shot. Thanks
again.

-F