Hello jo,
Although I am just a player here and not a moderator, please allow me to reply to your question.

It was because your initial rating was higher than your opponent's. The number of points you receive or lose is dependent on your opponent's score. 
For further information, please see FlyOrDie's rating system: -->  

https://www.flyordie.com/games/help/rating_system.html

Kind regards,
John

please see also: 

https://www.flyordie.com/forum/243825?s=hn