I downloaded the Linux Essentials PDF file from LPIC site, the link for which is https://www.linuxcertification.co.za/sites/default/files/linux-esentials-manual.pdf
I saved the PDF file on my system and opened it using Foxit PDF reader as well as Adobe reader. Now, when viewing the file in Chrome as a PDF, there are no Red boxes visible:
However when I view it in Foxit and Adobe, then these boxes show up:
What is causing this issue?
I tried converting the PDF file to word using online convertors and then converted the Word file to PDF. In most cases, the boxes were removed however the text alignment was distorted and few times even some grammatical error was seen.
I cannot rely on opening the file in Chrome all the time and wish to use either Foxit or Adobe reader to open the file. Any help would be appreciated.