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LTC4222 - unexpected beheaviour

I'm using a couple of LTC4222 to provide power to scientific sensors.

Because i don't fully understand the workings of this chip (yet) i'm stumped as to why one sensor keeps tripping it.

The device uses 12V 600mA nominal and i took all the component like the example in the datasheet for 12V.

Using a current probe the measured maximum current spike at startup (of the device) was 2,25A. 

I tried using a sense resistor for 6A instead but the result is the same. 

I tried increasing Ctimer to 10µF to no avail.

What am i overlooking or should i check?