Coinb wallet and BTC disappeared

[ghostofgenghiskhan]

I recently created a Coinb wallet and deposited some coins from another account. Initially, the coins appeared in my Coinb wallet. However, when I logged out of my wallet and logged back in, the wallet address had changed and the coins gone.

The private key I had recorded also doesn't appear to correspond to the address the coins were sent to, so my attempts to sweep the coins have been fruitless.

Is there any possibility of retrieving my coins?

Thank you.