why did my bitcoin disappeared from electrum

my electrum wallet bitcoin value is not correct, bitcoin wallet

Using Bitcoin peacetime online transfer, download Bitcoin wallet APP, in fact, is the account address and password, you can pay through this Bitcoin wallet to collect money, but be sure to remember the password, because Bitcoin wallet is anonymous, without any authentication, once the password is lost, no one can open your wallet, the wallet of Bitcoin will be completely abandoned, never enter circulation again. If your wallet password is stolen, you will never be able to recover it because it is anonymous and you cannot prove that the wallet is yours. Therefore, the general separation of the Bitcoin wallet from the network, can be printed on a piece of paper, called Bitcoin "paper wallet", can also be stored on a hardware storage device, called "hardware wallet"