Tool Setting Utility Problem

[impexio]

I have a problem with a 1988 VMC-40 2216 with a CPU 1400-5. When I go to the screen to set the tool lengths under the tool setting utility, the following occurs. I go through the steps of telling it the starting and ending tool number as well as the block height. I then go to set the length and it changes tool to the assigned tool number. Everything is fine up until now. I then hit the jog button to jog it to the right height and the screen flashes to the jog screen for a split second then I get the "waiting" message as if the tool has been set already. Has anyone come across this issue? Is it maybe a setting that I have off?
Thanks