Merchant Archive

How do I stop this. Is it my vendor itself. Is it the player that is buged what? I'm sick and tired of ppl buying 20k worth of stuff then mesging me asking me if I make fake crates or was I explioting the game to get my items back and cheat ppl yada yada.....

I just trianed novice merchant and I'm master artisan what do I need to do to fix this so I can actualy sell stuff without these problems???