Trade deleted
Yes, I put my player on the market for an unreasonable high price (around 15,000), but I did that during a time where only higher offers were existant and the player was at that time the best player on the market. Two players bid on that player and in the end the price was around 18,500$.
Shortly after that I noticed others were cheating and actually made a thread about it (https://www.lolmanager.gg/community/forum/topic/show/400)
You can probably imagine that it's midly annoying that my trade got deleted even though it was legitimate since I was relying on those 18,500$
TL;DR
I think your anticheat system overreacted a bit and simply deleted every trade with +10,000$ or something which isn't fair if a trade was actually legitimate.