This is what I noticed based from that bold phrase:
Either one of the two possible outputs
doesn't have two recent incoming transactions so those aren't your Electrum BTC address.
The other one looks like an exchange change address.
- 1G3BdSyNiyLGtyEN84T2wcvaGDzaZfGG3i - Last TXs: 2020-04 and 2019-08, can't be this one
- 3JsffzphrK2GpRJcLixKyxn7HuF2xn8CqH - Last TXs: 2020-04, just one
- bc1quq29mutxkgxmjfdr7ayj3zd9ad0ld5mrhh89l2: Received a total of 429,660.48723108 BTC (you're a 'whale' perhaps)
So, it could be a different Bitcoin address, it was changed by something or Gemini is lying.
Edit for the new reply: 1G3BdSyNiyLGtyEN84T2wcvaGDzaZfGG3i only have one recent transaction, it can't be the same address that you've used to withdraw from Coinbase.