Asian1323,
electrocardiograms may be altered by lead placement, as it is just a tracing of the electrical impulses produced by the heart as they course through the body. Certain anatomical differences may also produce an ECG that looks different than the "normal". The computer is only programmed to "read" specific looking tracings as normal or abnormal. Specific abnormalities can be determined by the computer such as inverted sequences, prolonged segments, premature ventricular contraction, etc. But, it usually takes a physician to actually interpret the tracing.
However, without knowing what the actual abnormality was, it is impossible to tell you whether or not your "abnormality" is significant.
If you are concerned, see your primary care provider and ask to have an official ECG done. Good luck.