If an entity is teleported the same tick it is summoned in, it will render at the wrong location for a while.

It can be seen clearly here by executing these two commands in the same tick:

summon ArmorStand ~ ~ ~

tp @e[name=buggedArmorStand] ~ ~10 ~

It works with any entity, but with an armorstand with NoGravity it shows for about half a minute instead of half a second.