When executing the teleport command, the X and Z coordinates are edited by .5 instead of the Y

I typed in "/tp <username> 100 25 100" and it teleported me to X=100.5,Y=25,Z=100.5. Usually minecraft accounts for block suffocation damage(at least I believe that's why it's done) by teleporting the player .5 blocks above the designated Y coordinate. Instead of this, in snapshot 14w21b, the player is teleported .5 blocks more on the X and Z coordinates and nothing changes on the Y.

I have attached a video that demonstrates this bug.