Strange behavior after DAI generation in previously liquidated Vault
The owner of the vault said he was liquidated to 0 during last crash.
Today he deposited new ETH to generate new DAIs: 1000. He says after that his debt was only 600 DAIs. He paid it back to zero his debt. Then he generated new 1000 and pay it back immediately. Then he generated 515 and this is his current debt
It looks like he recovered 400 DAIs. How come? I tried to reproduce it on my liquidated vault - no success.