There's two commands for pen lift:
C13,END - pen drop
C14,END - pen lift

Though you can also specify the position of each one with
C13,180,END
which would say "drop the pen by moving to position 180",

C14,90,END
which would say "lift the pen by moving to position 90".

Once the C13/C14 commands with the position parameter are used, the machine will remember the new position for the rest of the session - but it will not survive a reset.

When you use the "pen drop" or "pen lift" buttons in the controller, the position parameter is sent. The exact value of the parameter is set on the pen lift position section on the setup tab.

When you do a "draw vector", the C13/C14 command is used _without_ the parameter.

The optimizer knows the difference between C13 and C14, so your problem might be that the positions for "up" and "down" have been changed, or switched or something. You can test the positions using the
"pen up position"
"pen down position"
"test lift range"
"upload lift range"
options on the setup tab.

"Upload lift range" uploads the new range/positions, and sets it as a permanent setting for the machine, that will be remembered after a reset.

sn