Forms uses wkhtmltopdf to generate PDFs from forms.
However, wkhtmltopdf has a lot of issues. It is based on a very outdated version of the Webkit rendering engine, and the library itself is barely being maintained (it has more than 700 reported bugs as of this writing). Most of the modern features in HTML 5 and CSS 3 (such as flexbox) are not supported.
This creates many problems for Laserfiche Forms administrators and solution providers. As one of the latter, we spend enormous amounts of time trying to customize forms so that the look-and-feel of the stored PDF matches that of the actual form. Sometimes this is a legal requirement (e.g. many government processes) and sometimes it's a branding requirement. Either way, wkhtmltopdf ends up throwing severe hurdles in our way in almost every project.
So, feature request: please ditch wkthmltopdf in favor of a modern PDF rendering tool, such as Google's Puppeteer.
Thanks!