Why do you use blockchain.com in the first place when you have a hardware wallet? This doesn't make any sense to me.
However, if you don't see any balance in your trezor but all transactions, this means you have imported your mnemonic code correctly, but simply don't have any funds.
Keep in mind that you should NOT use that seed with your trezor and assume it is safe. You need to generate a new one (on your hardware wallet) Everything else beats the purpose of having a hardware wallet.

Blockchain.com support is the only one able to help you in this case.
And for the future: Don't use web wallets.