A graphic free of typos is something that we value as much as you do.
Generally we don't change the text or information of your project. This is why it's important to proof your text before sending it to us.
What our designers do is copy and paste into the design.
This is why it's important to provide the content in a way that'd allow for an easy copy and paste.
In case that we might have to transcribe the content there's a chance for mistakes. Our project manager and art director will try to avoid them but could definitely happen.
To avoid any mistakes, simply provide the content in an easy format, like a word document.