My Nose Ring Seems To Be Sinking Into My Nose.....has This Ever Happened To Anyone Else?

That typically happens if the piercing is done with a gun.  If you take the back off, it won't sink but it might come out of your nose.  You may consider letting the hole close and getting it redone with the needle, because the gun should really only be used to pierce ears.

You most likely have it on too tight...
The tighter you have it on, it tends to try to pull the stud through the hole completely...
This happened with one of my ears.

Well I have an nose ring myself . I just got my last Sunday . My nose ring seems to be sinking into my nose . Do I need a bigger earring ?

I am having a similar problem, its a clean piercing no puss coming out I have just noticed that it has slightly sunk into my nose a bit. I have put the back on the piercing so I am able to move it to clean under it so its not on tight,