Baserunning issues!

Any time I hit L to lead off runner if pitcher steps off my dude starts running

Am I doing something wrong?

I assume you are playing online because I've never seen an opposing pitcher step off without throwing to a base in franchise mode. The only thing I can figure is you are hitting the button for steal, and the runner takes off as soon as the pitcher makes a move. Base running is crazy in this game.

There are 2 L buttons associated with baserunning. So which L button r u using? What baserunning mode do you use?