Wye Delta Transformer Acting as a Source

I`m Studying my final semesters as electrical engineer and working on an electrical maintanence and desing company.

I would like a more expierenced opinion on the following situation.

I have an wye delta transformer on which I'm performing a three-phase no-load test. The thing is the power which is absorbed by phases A and B is negative, which means that instead of acting as a load the transformer is acting as a source.

The readings are as follows. These are Line to neutral voltages and line currents and phase power readings performed on the wye side of the transformer. Positive sequence

Va=269.83/0 Ia=12.66/-101.9 Wa=-707.62

Vb=269.88/239.6 Ib=15.32/141 Wb=-606.9

Vc=270.45/119.8 Ic=14.9/63 Wc=2710.019

In=14.9/-63.7

From this data I`v come to two conclusions.

1. The coils from the wye side of the transformer are unbalanced. See the phase angle between the phase currents and voltages, it is not balanced
2. The currents coming from phase A and B are flowing from the transformer wye side to the source.

I have a few ideas of what it could be, the current coil of the wattmeter is inversed, or the wattmeter is malfunctioning. But still I`m not sure what it could be, ¿Could i have an opinion on this matter?