Ok, here is the complete code to reproduce the problem. Load parameter_test.msl which includes functions.msl. From the screenshot you see the variables containing 
garbage, and you also see that from the ODB screenshot. For completeness, I added Sequencer.json which contains the whole sequencer tree.

The interesting thing is that this works sometimes, and sometimes not. I'm not sure if this in the GUI or in the sequencer program, so we have to sort out who can 
fix it ;-)

Best,
Stefan

INCLUDE functions

PARAM lv_start, "Start of LV", 1.8
PARAM lv_stop, "Stop of LV", 2.1
PARAM lv_step, "Step of LV", 0.02

n_iterations = (($lv_stop - $lv_start)/$lv_step)

MSG "Parameters:"
MSG $lv_start
MSG $lv_stop
MSG $lv_step
MSG $n_iterations

MSG "Start of looping"

LOOP n, $n_iterations
   lv_now = $lv_start + $n * $lv_step
   MSG $lv_now
   WAIT SECONDS, 1
ENDLOOP

SUBROUTINE sub1
   WAIT seconds, 1
ENDSUBROUTINE

SUBROUTINE sub2
   WAIT seconds, 1
ENDSUBROUTINE

SUBROUTINE sub3
   WAIT seconds, 1
ENDSUBROUTINE

SUBROUTINE sub4
   WAIT seconds, 1
ENDSUBROUTINE

SUBROUTINE sub5
   WAIT seconds, 1
ENDSUBROUTINE

SUBROUTINE sub6
   WAIT seconds, 1
ENDSUBROUTINE