help with guidance spindle

I set the orientation of the spindle with m19, it worked well, but I have a problem that as much as I put the same degree every time, it finds different positions of the spindle, for example I give m19r0 it finds a point and stops, but I do the same command again and it does not find the same point it goes to another point and stops, that is it keeps changing the degree 0 of place, sometimes it does it several times in the same place, out of nowhere it goes to another point and if I do it a few more times it stays there. At that point, out of the blue it changes the point again, can you help?

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