Corrupted PDF

Hi.

This is an amazing library. Thanks a lot @Hopding. I know you've been inactive for a while but the quality of the code and the support you gave for this during your active time has been absolutely phenomenal. You don't see such fantastic support even for paid products. Good luck whatever you're up to.

My issue is this: I have this PDF file than looks like this:

But when I open/save it using pdf-lib, it will look like this:

Has anyone ever had a similar experience?