GreatGatsby

Hey everyone, I'm thankful for this thread as it really gave me new hopes for my Silhouette Alta 3D Printer. I am trying to connect the printer to Cura by adding the printer under the "Custom FFF" option and I have followed the machine settings contributed by the people here. However, I have a small little issue....I am unable to key in a "20" and "10" for the X and Y min. respectively. Nothing shows up when I try to type positive numbers. It would only allow me to enter either 0 or a negative number. Am I doing something wrong? Thanks in advance!