I found a bug in the recovery tool.
4 days ago I did successfully publish and confirm the proof but today it wasn't confirmed on the tangle.
So I tried again with the same old seed/new seed and this time, the transaction was made and confirmed to an address that isn't on the new seed. I did it a second time and an other transaction was made and confirmed to this unknown address a second time.
I am checking my seed and I cannot find that address.