it quite simple actually .. If your inventory shows that u have 100million but in fact u have only 50 million .. When u loot 100k on the floor ... it will show on your inventory 200k ... When you buy something from any shop it will double the price . Example Zakum helm which costs 20m ... but when u buy it ... it is 40m ... This is the mesos bug ... To fix negative mesos .. u just have to find somebody to trade with you mesos .. like if u have -24m someone has to trade to you 25 m .. and your negative mesos is solved . ^^