Electrum I requested wrong amount QR code but paid larger amount from luno?
In Bitcoin, the sender chooses the amount to send. Because you corrected the amount in Luno and the correct 0.1 amount is showing (although currently unconfirmed) in electrum, you know this is the balance you will receive once the transaction is confirmed.

To understand why it is currently unconfirmed, see Why is my transaction not getting confirmed and what can I do about it?