looks like the ground-fill is working alright to me.... It looks like this circuit is not done, you have an RGB LED with only the green anode hooked up. But I'm sure you knew that.
555 TIMER PCB.fzz (9.7 KB)
If ground seeds are marked wrong or some items touch you'll have an issue with the ground fill.. But I played with it for a few minutes and done.
Good luck!