I added a photo to an FAQ item in the demo which you can see here:
https://osticketawesome.com/1.10.4/scp/faq.php?id=7
I am able to create a PDF that successfully integrates the image.
I really suspect that your issue has something to do with the way that the images where attached to the FAQ items. I would suggest removing each image and adding it back. Let me know if that works for you.
BTW your company logo looks great! Nice job.