When using a touchpad to enroll your BioSig-ID password you will use one hand to hold down the corner (left button) while using a finger on the other hand to draw each character.
It is important that you keep the corner of the touchpad held down for the entire stroke. If you let up on the corner (left button) it will create an additional stroke and expect to you draw it with the extra stroke each time.
If this does not solve the problem you may submit a support ticket for additional assistance.