PDF Content not set on opening of pdf

hi,
I am using radaeepdf library in my project. There is a pdf doc which i have opened using radaee pdf library.
the pdf is getting opened but the entire content is not getting loaded, only some of the content is loaded.
This is happening with only 2-3 pdf's. , most of the pdf's are opened perfectly.
Can you tell me what could be the reason for it?

Are the missing part of the document images or text?
May you provide us one of your file, please?
If reserved, open a trouble ticket in the support area and submit as bug to my colleagues.

The missing part is text. But this is happening with only some pdf's. Most of the pdf's are opening correctly.
I just want to know the reason for content not displaying properly?

If text, it seems to be tight to some missing fonts.
Let's us get one of your file: we will check missing fonts and help you including them.

some of the pdf's were opening before, but now those pdf's are not opening.
I have tried opening this pdf using your demo project, and it is opening perfectly. But the same pdf is not opening in my project.

The pdf which is not displayed properly is attached below