Odd behaviour in a routine... G83 Peck Drill... double drills some holes.

Normally you would have the ^1000 on the same line as the canned cycle.
Once in canned-cycle mode you get a hole every time you specify a position.

So, it enters G83 mode and drills a hole at the current positon.
Then it moves ^1000 and drills a hole
Then is loops round and drills a hole at the current position

Try putting the G83 outside the loop, and then have a G80 after the end of the loop.
Or put the ^1000 on the same line as the G83.

As things are both lines in the loop drill a hole.

linuxcnc.org/docs/2.7/html/gcode/g-code.html#gcode:g80

Maybe I didn't explain clearly enough.

G83 is modal. That means that after a G83 any movement comand (X, Y, Z, @ ^) is taken as defining the start of a new hole.

You loop therefore has two holes every time through

enter loop
G83 - drill a hole at the current position
^#1000 - move and drill a hole
back to the top
G83 - drill a hole at the current position
^#1000 - move and drill a hole
...
Put the ^#1000 on the same line as the G83 and you will only get each hole once.
Alternatively put the G83 before the loop and only have the ^#1000 in the loop.

Or put a G80 before the ^#1000
Or make the ^#1000 a G0 #^1000 (to change the motion node from G83 to G0)