you are  doing something wrong here and it is impossible to say what. a transaction doesn't just disappear from your wallet for no reason. the only case that a transaction is disappeared is when it is invalidated for example if the same inputs (that was used to pay you) were used in a different transaction and that tx got confirmed. aka a double spend.

reading your first post another time, something else is worth checking out:
when you say the third one is with no bitcoin but has transaction history, in that history do you see a greet tick sign or a blue computer sign? maybe you created the transaction and forgot to send it. does it say "local" in front of it? if so either double click and select broadcast from the window that pops up or right click and choose remove so that you can re-spend the coins.



that is the only other case that i can think of where the network doesn't know about the transaction because it was not sent out and your wallet doesn't show any balance because it thinks they were sent out in a transaction that only your wallet holds.


yeah, it has been so long since i have needed any coins mixed that i've nearly forgotten how it works.