Is this a bot? Is this the exchange trying to cheat users?
Thanks for your help!
Edit: it happened me in few medium-small exchanges.
Honestly, this happens to me sometimes on liquid exchanges like Binance when I'm trying to get filled at the spread. It's just a low liquidity, low volume market. This effect is amplified with the tokens you're trading.
It happend to me in IDAX and P2PB2B.
And if your answer is: just leave that exchanges...
I can't, because I have some rare tokens to exchange and are only listed on that exchanges.
Beggars can't be choosers. If you're bagholding low volume coins, you can either wait on the other side of a wide spread and hope.......or dump. That's why there's someone with bids at 20 satoshis, because a 10 satoshi spread actually justifies the risk of bagholding an illiquid token.