Explosions (including trinitrotoluene (TNT), fireballs, and creepers (mob), and TNT minecarts) (I feel like a programmer putting in functions... XD) in Minecraft 1.8.3 do not repel players in Creative mode. However, if the player is in Survival Mode (did not test for Adventure Mode), the player will be repelled by the explosion. The bug is very simple, yet this bug is highly inconvenient and is counterproductive to testing with entity explosion repulsion.

To reproduce the bug, you need a source that will give off an explosion, and you need to be in Creative mode. After you have the source, trigger the source to explode while you are in a close radius of the explosion. It does not matter whether you are flying or not flying. If you tested this in Minecraft 1.8.3, then you will be unmoved (check coordinates).

There is no need for a picture.
Note: damage from explosions are still intact and not bugged (not having a problem; not talking about spying bugs (machine)), and this is in singleplayer.