Local transactions are transactions that are recorded  in the electrum wallet file but not known to the electrum server you are connected to. Electrum depends on electrum servers to interact with the blockchain including finding transactions relevant to your wallet. Because these transactions are for bitcoin cash and not bitcoin so the electrum server you are connected to does not know about them since it's a bitcoin electrum server. You can simply right click on the transactions and choose to remove them from your wallet file. The balance will then update.