When I try teleporting an entity to me or relative to me (or another entity), sometimes it works perfectly the first time, Every other time, though, it kind of falls out of sync. The best way I can explain it is, when I try to teleport an entity PRECISELY to another entity, it only teleports it relative to the desired entity, based on where the teleporting entity is currently located. This video should hopefully clear up any confusion. PS: I first noticed it while trying to teleport an armor stand to myself, so it isn't just a wacky bat mechanic.