Did you create the wallet and got those 0.5 BTC yourself?

Are those 2 separated wallets (different wallet ids and passwords) or the one with 0.5 BTC is like an additional/extra wallet that you created on the same blockchain.com account as the first?

But in the step 6 (derivation path), select “legacy” in the top and change the second 0 (from right to left) to an 1.