Ok so I'm attatching 3 things:
(1) A screen shot of what happens when the file is opened with Adobe Acrobat Reader (4 different people have tested it). The error message is in spanish and says: "There is an error in this page, Acrobat may not open it correctly. Contact the person who created the PDF to resolve the issue".
(2) A screen shot of how it should look like. In this case I opened it with pdfelement.
(3) One of the files that presents this issue. As a reference, this is an airline ticket that I downloaded in pdf format from the Airline Company. Then I edited the file with PDFelement. I removed some text and unnecesary pages, then I merged for pages together.
I hope someone can help because otherwise, there is no point on me having this software if no one can read my pdfs. 😞