I wonder if you screwed in the filler cap when you checked the level, as has been suggested - a common mistake I am sure. If you did, it would say your level was OK, even though it is really a bit low.
You may also not have drained all of the old oil. Did you warm the machine up first ? The oil drains slow thru that tube. No big deal if you left a bit of old oil in there, but that may explain why your level reads OK even tho you didn't add 2.2. qts yet. The .2 qts is only 6.4 ounces (half a beer bottle) but you should add it if it looks like it needs it. Why not go up to "full" ?