So hopefully this is interesting for a lot of other users having issues with Blockchain.com:
Never believe the numbers and amounts blockchain is showing you in the Settings/Wallets/Adresses sections, for me there are a lot of false amounts.
Glad that it worked out at the end.
About your note, Settings isn't really the best part to check your wallet's balance.
For the former missing balance, there's a button in that same setting page to toggle from Legacy to SegWit addresses.
It could also be in your change address which I believe won't be displayed in blockchain's "
Wallets & Addresses" setting.