Did you make any sending or receiving from that wallet? The wallet shows your total balance you have, while the Explorer shows you only one address.
If the money appears in your wallet, do not worry, you can spend it, or if you do not know the address that contains these currencies, you can click on the Receiver button, and send all the money to that address, then it will appear in the explorer and in your account.

When you said about Blockchain, do you mean blockchain.com wallet? Sometimes people buy Bitcoin cash coin by mistake.