Much of the trouble they had with high and low calls was the heights for players had been reported incorrectly, or wasnt up to date... but then also whether the strike zone would be programmed as the 3D version, or a 2 plane version where only the front of the plate would count.
They also experimented with programming a slightly wider zone to be more in line with how how human umps expand slightly.
The complaints they got were pretty hilarious though. Like when the catcher sets up outside the zone, the pitch misses the target completely on the inner half and the catcher has to lunge to get it, and still gets called a strike because it did go through the zone. Optically it looked horrendous even though the ball went through the zone.