Guild Wars 2

Mid game, I noticed that from about 12 gold, I had 1 gold left.
Is this a common problem and how do I get it fixed?

Have you been in World v World?

Were you attacked by a thief ?

Nope, was not in WvW and was not attacked by a thief.
I was exploring with a friend in a party at shiver peak when I noticed that most of my gold is gone.