Ok, so to get the "ether" back you would have needed to click on "redeem winnings" then the eth would have been back in your account. What you did is send control of those shares to your eth address. That means the address you sent those shares to now controls those shares.
If thats a address, like a exchange that you do not control then those are probably lost. However, if you have control of the private key for that address you can either send them back or redeem them with that account.
So if you have control of the address you sent the shares to, go ahead and connect using the "old_dapp" and you will actually see those shares in your account.(basically you need to load geth and then connect it to gnosis)
Let me know if that makes sense or you need any more help and as always dont give anyone your private keys