Guild Wars 2

Hello, i play guild wars often and sometimes when i map travelled or went on the trading post i lost almost all my money this just happened again, i lost 20gold with it and is happening very often lately with each other i lost about 60gold.

How is this possible?

any of those?

• waypoint costs;
• 15% trading taxes;
• forgot to withdraw failed orders;
• too many items queued on trade post withdraw window;
• bought something and forgot about it.