Find the following line in your _feedback.php:

$comment_author = isset($_COOKIE[$cookie_name]) ? trim($_COOKIE[$cookie_name]) : '';

And change it to:

$comment_author = isset($_COOKIE[$cookie_name]) ? stripslashes(trim($_COOKIE[$cookie_name])) : '';

Otherwise apparently stored author names that have single quotes in them end up with lots of backslashes on retrieval.

The same probably happens with the email and URL lines as well, but they are a little less likely to have single quotes anyway.

(v0.9.1)