If I understood right, after sending money to your Electrum address, you've noticed that the receiving address has changed? If that's the case then that should be normal behavior as you have multiple addresses on the wallet, and electrum is supposed to give you a new one with each new payment request.
Just to confirm that you haven't sent the funds to the wrong address, go to Blockchain.com and search for your receiving address, If you see that the money is there, go back to your Electrum and type this on the console:
ismine('paste_your_address_here')
If the command above return true, then you sent to the correct address and you should also be able to see something in your transactions history and your overall balance on the bottom of the wallet.