I think it is fair to assume that all of your wallets are compromised if at some point you accessed them from the same device. Better move all of your funds to a new wallet asap, better to be safe than sorry. Make sure you use a secure device or at least reinstall your system. We probably won't be able to find out how exactly they got your wallet, just make sure you don't rely on centralized service in the future and improve your security practices even if you feel you're doing it pretty well already.