The original PPKs didn't feed well often unless the barrel was throated - the new S&W versions supposedly hare better at this.
I assume the gun is new? If so, it needs to be broken in maybe.
Lubrication may have been possible too - oil it well before ya go again. Also, try another type of ammo.
1 time isn't enough to diagnose. Put 200 rounds thru it 2 or 3 times, and then see how many times ya have issues w/ it.