You are always delegating all Ada to the same stake pool – the “Controlled Total Stake” shown by Cardanoscan.
The 34 ADA shown in the transaction are not the amount to be staked, but the amount in one of your addresses that was used to register your delegation.
The delegation registration is a transaction on the chain. Such transactions always have to move some Ada from one address to another (or the same). In this case, your wallet application has chosen an address (addr1q9y86rykw0jdt0esf8g2y7y9dnp7hyp7tpwf4ez86jfzs4luw7nfzwm79hj9va6tek7nl5k2h4nu8urfvvc4wj0j5d2qq7u7ld) with 35 Ada from your wallet and the transaction moved back 34.826139 Ada (35 Ada minus transaction fee) back into another address (addr1q99d7ydtzcpzxypfvz754ytvyawfzl7xy805lv9praxp5thuw7nfzwm79hj9va6tek7nl5k2h4nu8urfvvc4wj0j5d2qxdu6ms) also in your wallet.
The total amount in your wallet has just changed by the transaction fee and the total amount is staked to the new stake pool as it was staked to the old one.