That is to be expected, they haven't started this list yet. They've focusing on 'already read' and some users have found that manga from the other two lists have somehow gotten into the 'already read' list too. Don't worry, I assume they'll look into it later on when the restoration is complete.
No, the lists are just jumbled up onto the already read list. Hopefully they can restore everything back into their proper lists. Otherwise the users themselves will have to try and sort them
Yes, that is as I said, some users have found the to read / reading lists are in with the 'already read' list. It's expected that this would be sorted when all the manga are restored.
My completed list is slowly coming back but i am reading is still missing (〜￣△￣)〜