Why the transaction size so big? 8511vBytes ?

Hi Bitcoin guys,

First, congraturations every HODLs! BTC will hit 100k soon! Second, I encountered a problem when I using Electrum to make a transfer. Need some support here!

The things I want to do is sending my btc from a paper wallet, I would like to keep my paper wallet offline, so I refered to the guide below by using one online electrum client (import public key) and one offline electrum client (import private key)

How to spend from an offline paper wallet using Electrum

https://bitcoinelectrum.com/how-to-spend-from-an-offline-paper-wallet-using-electrum/

when I initial a transaction on the online electrum client, it shows the transaction size is 8511vBytes, which is way bigger than a normal transaction, the screenshot attached.

Anyone knows why the size is so big? Anything I can do to lower it? Thank you so much! BTC to the moon!

https://preview.redd.it/t7lzscl86o2e1.jpg?width=796&format=pjpg&auto=webp&s=bbb0ae2529fa236f483dc43a18080227da014124