FOR...NEXT strange counting

[flotulopex]

Hello,

I can't figure out how the FOR...NEXT count works.

First my code, then my question.

...
Duty VAR BYTE
Duty = 0

if duty = 0 then
   FOR Duty = 0 TO 254
      HPWM 1, Duty, 1000
      lcdout Dec Duty 'First read of "Duty"
      PAUSE 5
   NEXT
   lcdout Dec Duty 'Second read of "Duty"
endif
...

At the end of the FOR...NEXT execution, first read of Duty = 254. Right after the "NEXT" command, the second read of the variable Duty = 255.

Why is this!?