[Oatka]

and in the last few seconds, somebody outbids me with $82. I try to outbid, but there isn’t enough time. I lose! WTF happened? How did anyone know my highest bid of $81?

He didn't. He's a "sniper" who comes in at the last second and makes a bid. It's a common practice. He bid at least $82 (probably something like $90) and legally outbid you.

[Revolting cat!]

No, but the highest bid was $73, as I said, why didn’t he bid 74, 75, 76, why did he bid just above my supposedly “secret” max of 81? Something fishy.

[Revolting cat!]

Never mind, I get it, he must have proxy bid himself!