Question regarding the xp thing near our Avatar

So as everyone has noticed there's something under our name, rank and avatar that states how much xp we have. What is the point of it?

When we gain xp through missions and it gets approved via update requests I know that sometimes that amount we just gained is added to this counter. Sometimes it doesn't seem to be added however. Also it seems that when we post or something unrelated to an admin updating our xp, it increases. For instance it says that I have over 500 xp under my name but in reality I only have 433.5xp.

Does this mean my xp is the over 500 that it says under my name or is it still just my 433.5 that I earned through missions nd training and whatnot. Either way its really confusing and I would definitely appreciate some sort of explanation of how it works.

Thanks!

You auto-gain exp for posting, and admin add the extra exp you get to that when you update. When I approved your update, you were shorting yourself the hundred or so exp you already had.

Really? So you do get extra xp for posting? Alright cool, sounds good to me.