Sorry, obviously I was not clear in my answer.
I copied your text without any changes in Mach 3. I run auto tool zero. it holds a few seconds (dwell is ok) goes down the way it should. very slow, I guess 50 mm/minute. then it makes contact with the probe. (for safety-reasons I do it manually high above the router-bed) Then it goes down quite far, I guess about 10 cm. stops, goes up 10 mm, and the DRO says + 10.0005.
So everything seems ok, besides the bit when it makes contact and should just go up, in stead of lowering the Z before it raises it again