Radius not working properly

I am not sure if this is a bug or not but, when I use
effect @p[r=10000000000000] 17 0 0
the radius doesn't work even if i am only 150 blocks away!
The clock it runs off of and the command block itself are in spawn chunks so they don't unload.
This buts a HUGE setback om my adventure map!
AH!