If your lead page layout is incorrectly formatted because the Original Referrer field is too wide or long, follow these steps to correct it. You'll need administrator rights in your Salesforce account.
The following solution will not work in SFDC Professional Edition because it involves removing a Marketo field from the SFDC page layout.
In short, you'll create a new custom field in SFDC, then use a formula field to shorten the Original Referrer field instead of the original standard Marketo field.
Note: The above formula takes the first 140 characters of the original field (mkto2__Original_Referrer__c) and display it to the 'new" field you're creating. Then, it takes the COMPLETE value from the original field and turns it into a hyper link.