lilTanker saidThe tip your seeing is called the xiphoid process, why the he'll it's called that I don't know, the tip on your coccyx is also named xiphoid process.
Anyway, what's more likely is your body shape is just designed to be more prominent in that area so having lost all the weigt you have (congratulations on that btw) you can now see it clearly.
I have a similar problem, one side of my sternum sits higher then the other, after an accident as a kid it sits even higher then it used too on the right side.
Don't worry your self to much sbout it, keep working on getting w body that is as healthy and strong as it can be, we all have little hints about our bodies that makes it different.
The xiphoid process is sometimes simply called the xiphoid. Also known as the ensiform cartilage or process.
The ancients thought the xiphoid looked like the tip of a sword.
The word "xiphoid" is from the Greek "xiphos" (straight sword) + "eidos" (like) = like a straight sword.
"Ensiform" is from the Latin "ensis" (sword) + "forma" (shape) = sword shape.
Just a little nerdy detective work for you, lilTanker...