EKG results were abnormal, but echo and stress test was normal. Should I be concerned?

My ekg came back abnormal, my PCP referred me to a caridologist i had another ekg which came back abnormal again they performed a stress test, echo and i had to wear a heart monitor for 24 hours results was normal. the cardiologist even cleared me for breast surgery. I'm 32 yrs old 5'5 117lbs in good health smoking for a few years but stopped. I'm concerned even with medical clearance of why would my ekg be abnormal and hoping my surgeon is comfortable to still perform my surgery.