Replying to Oil change question

So, long story short, I bought a new car recently, due for an oil change so I changed it as I have for every other oil change on every car I have owned. Owners manual calls for 6qts of 5w20 including a new filter. I put the 5qt jug in and let it settle, ran the engine to drive to that auto parts store to get the last qt and got home and let it sit 5 minutes. Checked the dipstick and it is about double over the full line. I let it sit longer with the same results.
So, I wondered if I maybe didn't drain it all. I measured 6qts of dirty oil in my drain pan (which was empty to start). So, it fully drained.
Am I retarded at using my dipstick? Anyone seen something like this before?