strange FOR behavior

[findstr]

Hello!
In interactive cmd.exe prompt:

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cmd /V:ON
set counter=0 & for /L %K in (1,1,6) do @(set /a counter+=1 & echo !counter!)

The result is:

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11
22
33
44
55
66

I expected it to be:

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1
2
3
4
5
6

What's wrong here?
Thanks!

[aGerman]

It's not a matter of FOR. It's SET /A which already prints the result if executed in a command line.

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@set /a x+=1

Steffen