Bug 578

Summary:

Hi, When I was playing the game, I found that when cxk is playing basketball, accidentally, there are some white lines at the bottom of the cxk. Even though it does not affect the overall flow of the program. It is really annoying when playing.

Steps to reproduce:

1. Enter the game.
2. In the login scene, click the button "IELTS".
3. After entering the playing scene, you can observe the situation.

Expected outcome:

It is expected that cxk (sprite) will move without occasionally generating the white line under his foot.

Actual outcome:

cxk (sprite) will move while occasionally generating the white line under his foot.

Possible concern:

I am not sure whether it is the rendering has some delay or our picture has some problem.