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Abobe Acrobat Merged Documents Garbled Text

I'm having a problem when i merge two PDF documents.  The process that i run through is to open the first larger document and then from within Acrobat i run through the INSERT routine.  Once the insert is complete random words and characters are changed to garbage.  It looks similar to the wingdings font.  Some words are completely replaced while other words are only partially replaced with bad characters.  All of these words are written in English

I'm using a Windows 10 computer with Adobe Acrobat Pro DC Version 2015.006.30508

Is there a way to merge documents without the words/fonts becoming illegible?
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Commented:
PDFs can come in  6 different encodings. These encoding are applied automatically depending on the platform, font and characters used. There's not much you can do to fix this using Adobe software. You can avoid this by fully embedding the fonts (not subsetting) when creating the PDFs. Creating PDF using PDFMaker on the Ribbon instead of printing to PDF also helps. Do you have access to the source documents?