And actually how ratings work, especially before you get an established ratings, sometimes a win against a lower ranked player will make your rating go down (Mathimaticly) - but the system here is set up to not let your rating go down with a win.

Plus your rating may have went up. For example, the first time it might have been 1966.1, after the next win it might have been 1966.35, etc... etc...

So it is very possible that your rating will not move - and act very strange until you start getting many more games to get an established rating. :-)