PDF generation error, Only 2 pages exported of article

please check:

https://www.learndigitalaudio.com/blog/dynamic-range-compression-pt-1-what-is-dynamic-range

click the ‘download article as PDF’. only the beginning portion on the article is generated as a PDF! this error has not occurred on another 2 posts i tried. do you know what is happening?

thanks!

https://www.ads-software.com/extend/plugins/wp-post-to-pdf/