I’m not sure why time remapping is causing the motion blur on that layer. Maybe it causes the motion blur to ignore the relation to the camera movement? I don’t know. But as a workaround you can either make a copy of the duck pre-comp and turn the motion blur off for the duck layer inside of that pre-comp, OR make the pre-comp large enough so you don’t have to scale it above 100% in the main comp and turn off the continuous rasterization switch and just use the motion blur on the individual duck pre-comps to control which gets blurred. Does that make sense?
It looks like everything on your site is from tutorials I’ve seen. If you’re trying to impress people with your skills then you should do something original and not try to pass off other people’s work as your own.