Hmmm.
As you may know, the T-wave (as well as the other waves) in an ECG, reflect the electrical activity of the heart. The direction of the wave (the vector) reflects electrical activity in areas of the heart, related to the pumping of blood by the different chambers of the heart, in response to nervous signals.
In some individuals, especially in different ethnic groups, there exists variation in the direction of the vector. This can exist as a normal anatomical variant, and at 27 this is most likely the cause, HOWEVER, changes in the vector also occur as a result of damage to heart tissue (from many causes), which in turn affects the electrical conductivity of the heart, hence the requirement for further investigation. Hope all goes well for you.