Ive had slightly runny eggs as well - its only due to the chance of salmonella as far as im aware and in the 24 years ive been eating them and the 50 years my folks have there has never been a case of salmonella - im betting its odds on I wont get it in the next 6 months, so the occasional runny egg is fine, just so long as the white but is cooked propperly (no slime)