we have an issue with Email description shown for the customers

Hello Team,
We use the Woocom email template customiser and we face an issue that when the email is sent it shows the title from the title given in customiser but description is default ( it takes the first few texts combined from the email template and in our case that doesn’t make sense) we request to help us here to let us know how we can rewrite or customise the description of each email sent)