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Help with rotating head

Hello all!

I am facing this issue and I am not sure if this is normal (it shouldn't be imo)

Setup: TIGO SF TP20 module
PC-Dmis 2017 R2

To put it simple, I am taking a vector point at -1,0,0 on a plane with a probe at A0B0 workplane Z+
I am repeating this exact same point but going from the side with A90B-90 (whatever workplane, gives the same result)... and I am having a 15 to 30 microns deviation between the 2 measurements. This applies to +1,0,0 also and to more than 1 probe.

I have 2 other TIGOS with the same setup and I have not noticed such a strange behaviour. Is it normal to have 30 micros deviation between scenario A hitting perpendicular to the probes axis and scenario B hitting parallel to it?

I find it very weird.

Finally, I am correctly calibrating, setting up parameters as move speed/ touch speed/ prehit and retract. When locating the calibration sphere in a seperate verification program, I see no deviation btw... Thanks in advance for your replies!