You better get under there and check that drain plug. The shop may have stripped the threads, left the washer off or left the plug a little loose. I had a Saturn V6 with an O-ring in the face of the drain plug. It tended to stick to the oil pan so I started oiling it with special friction-modified gun oil when putting it back on, which solved the problem. I never did replace it. If your drain plug washer is rubber, you shouldn't have to replace it every oil change. The washer should be oiled and the plug tightened to the spec. If the rubber washer gets hard or starts to crack, then replace it.
Another thing that happens much too often is the oil filter gasket sticking to the engine and not being removed before the new filter/gasket is installed. This will cause a leak, sometimes a bad one. It's very hard to tell where oil drops originate without getting under the car and looking. A drain plug can have oil dripping off of it that came from higher on the engine, for example.
2011 Sportage EX
FWD Auto Silver/Black