Working the auction bannable?

So i was working the auction for almost 2-3 hours today and noticed some 88-89-90s were cheaper cause of the TOTS event and was working the market, trading cheaper 88-90s for a much more expensive 88-90s.. then i played a squad battle game and left to go afk to do something, came back then finish the game then boom! all of my coins gone.. then i went to restart my game and apparently i was in a coin distribution? 

So what gives? I dont see it in the ToS we are not allowed to work the market? What could i have done to have caused this??? Please help.. 28 days in game and spent almost 2k in the game.. i play HUT full time all year round..