redset | backed sorted set useful for coordinating distributed work | Architecture library

I'm making a simulation of a traffic light and a car. When the light turns green, the car should move. (I'm aware that actual stoplights don't jump from green to red, or from red to yellow, but...just go with it). The program takes input from the user as to how long the stoplight should loop; it starts by remaining red for 3 seconds and then looping through the other colors.

So my problem is that when I try to move the car (represented by a Rectangle object here) and wheels (two Circle objects), the graphics window appears to be creating an entirely new rectangle, despite the fact that I haven't called the clone() method or anything anywhere in my program. Try running the program for 8+ seconds to see.

Why is the car rectangle making copies of itself instead of just moving the original?

Code below: