Marin, It's too easy to refer to the game manual. This concerns more managers than just the buyers and sellers of the affected transfers. With all due respect to division II or III teams, but this will also influence this seasons B3 tournament where differences between teams are very small.
The current B3 champion bought a player for € 1,2 million which is below market value. I won't reveal his tsp because that's also not fair, but that's a really great player for B3 games who will have an impact. The player was bookmarked by 15 other managers and would sell for way more money than that.
Now you can say that the responsibility lies with the seller but 31 competing B3 teams are at a disadvantage because of this. The result of this bug is that at the start of the knock-outs of the most prestigious tournament in buzzerbeater you don't have a level playing field anymore. That's what's happening right now. And this is highly unfair to all other B3 competitors, myself included.
To have a fair B3 tournament there's only one solution: you should undo the affected transfers.