Sport mode issue please help
 

Hi so I jus got my es4 a few weeks ago and it has 190km on it and I have had no issues, except when the throttle magnet fell out of place and it was a pretty easy fix but.... now when I start my es4 and put it in sport mode it only goes up to 15 km/hr . As per before the throttle magnet fix it would go to almost 30km/hr
Pls if anyone knows how to fix this I really want to pick up the speed to whwre it was last week. Its depressing riding it and i feel limited to only 15kn/hrs
I was ripping by bike riders and even other e bikes but now I'm being passed by everyone on the road. Pls help . Thanks