wkhtmltopdf从文件随机空框生成PDF

I'm using wkhtmltopdf to create a pdf from a file (using PHP if that's important) and it's working great except for a random empty box. Here is what I've tried to get the box to go away:

1. Changed encoding for wkhtmltopdf to be UTF-8
2. Made sure the file was encoded using UTF-8
3. Checked the MySql database that it's pulling from to make sure that the encoding was UTF-8
4. Doubled/Tripled checked to make sure there is no extra character at the end of the line.
5. Deleted and re-inserted the database row
6. Rendered everything except that database row and the box wasn't there, so I know it's that entry.

Here is a copy and paste of the box from Adobe Reader in case it helps: