I think I just recovered then lost all my bitcoins from 2016

I had a multibit wallet in 2016, today I found the seed phrase on an old hard drive. After some research I imported the wallet into electrum with the seed phrase. The balance was showing. I send a $10 test transaction to my current BTC wallet and it arrived fine to my current wallet. But now my balance on the old wallet is showing as 0 It seems like the remaining balance has been sent to a change wallet that I do not control When I export the private keys in Electrum the change wallet is not showing. I have reimported the old seed phrase into Electrum and the balance is still showing as 0 Have I lost the funds the same day I managed to recover them? I won't reply to DM's