Could you at least provide the address of the wallet that you're referring to? At least that could help us understand more of what you're trying to explain in Op
We have so many wallets out there that have good reviews but still yet you chose to use blockchain.com, I once created an account back then in blockchain.com but had to abandon it due to some red flag I saw and migrated to Electrum.
But there is also one other thing, when I checked my blockchain wallet a few times this last few days it was left with only £29 and I thought why have the thieving shits done that, but a few days later it went to £43 and today it is £65, I cannot work any of this out.
The only thing I can think that could possibly have caused this is that maybe the price of some of your coin rose to some certain amount and that lead to your wallet balance increasing.