Is d a drive or partition?
You should have just done an eboot with the right sdb to solve the problem, or at least done a normal decryption.
Force decryption has no safeguards, so you have double decrypted some sectors now, you need to undo this operation (I hope you wrote down the sector range?) or start again with a clean image.
It's worth checking of course that d is indeed encrypted, and that you have the right key for it.
Any Suggesion ?
just force decrypt the partition with the correct key, if indeed it's fully encrypted?
If not, then you'll have to work out where the encryption finished.
I asume that youre already force decrypt eith wrong key later you realize it and found a correct key
if you're sure that you're already force decrypt with wrong key.. what you need to do before force decrypt with correct key is to reverse back the first mistake you've done.. by force encrypt it with the wrong key that been using for force encrypt.. after you've reverse it.. Then only force decrypt it with the correct key..
Tips : Use workspace to check the disk conditions..