We don’t have enough informations to help you.
How did you spec swipe?
Are the dps numbers taken, while in idle state? Or With any buffs active?
Basic Attack dps is almost useless for any kind of comparison, since no build in LE use it.
Only exception would be the Swipe Node “Natural Cadence”, which also makes Swipe a cooldown Skill, so it’s still useless to compare Swipe vs Basic Attacks.
With the very limited informations we have, i would say, that you might specced some ailments on swipe, hence the Executioners Axe is dealing more dmg with Swipe (Ailments are calculated for dps)