Effect of Normalisation in Gradient Boosting Trees

HI All,

I am dealing with a small data set of 90 rows and 29 features.I tried many algorithms and stopped at gradient boosting and based on my knowledge gradient boosting does not require any sort of normalisation of numerical data.But when i applied normalise on my data the result got improved little bit and the change i noticed is in Weights coming from the Gradient boosting  algorithm,

one of the numerical features where i got zero weight with out normaisation has got highest weight with normalisation ,Could you please help me out here which one to consider.