I sent bitcoin to my electrum wallet i received it, decided to send a little more to that wallet so i put in the same address i sent to the first time, hasnt showed up yet and now when I click on bitcoin receive address the receive address is different than before am i missing something here?
No, nothing's missing.
A new address is generated for anonmity purposes once the old address has been used once. You can still use the old address as it's still owned by your wallet.
What is the TX id of the second transaction (or the address you sent it from)?