Hi @Spireneusz And welcome to the Forum!

Rest assured, this is not a bug. In our auction system, managers from all levels can bid for the same player, as only the stars are important (after the Manager acquires the player, his attributes will scale accordingly). Regarding the insufficient cash, you can put down more cash than you actually have, which will put you in debt.

Check out this FAQ for more info on the topic

Tokens are the actual limiting factor in auctions, as you can't bid more tokens than you have in store.