Newbe question on use of application

I am following your hand waving example. I can easily use the phone to create idle, left/right, up/dn, and circle data. when I attempt to use edge dashboard to split the data into training/test sets it does not randomize the data but instead selects one of the four data streams (eg idle) as the test set. There must be something simple that i am missing, Thanks my project id is njbungard project