The Knot tools are notorious for having glitches. I don't know if there is a way to print out your list from there. I would suggest copying it into an Excel spreadsheet and printing from there.
i've done it a few times; when you are onthe guest list manager click on view summary. underneath the stas it has "Lists" yuo can pick whatever way you want your guest list to print and then click export - it pops up in excel.
Re: How do I print my guest list out of the Knot Tool