From robot game updates
16 - BORDER HEIGHT REMINDER
Remember that the height of the table border walls at a tournament might be different than the height of the border walls of the tables you're been practicing on. The Field Setup page (and Update 8, below) give allowable border heights of anywhere between 2-1/2" and 3-1/2" (64mm and 90mm). If you rely on the upper third of the boder wall either being there or not being there, this variability may affect you.
Are the vadcfll table borders at the 3-1/2" height?
Our robot depends on that upper third being there as currently designed.