Dear Raider_007,
Thank you for having posted your question on the forum.
After investigation of the drawing, the problem seems to be due to a problem with the arial font used by local Inventor styles.
Potential cause: Texts corrupted in sheets 3, 4 and 5.
Observations:
- Problem with sheets 3, 4 or 5 when exported.
- No problem with sheets 1 or 2 when exported.
- All sheets exported at the same time (Export > pdf > option >All sheets > ok > save) => no problem
- Sheet 4 moved up at first position in browser > export all sheet (as in step3) => problem visible on all sheets of pdf.
Workarounds/Solutions:
- Change Text style > Current BSI > "Font" > Arial to Arial Unicode MS => pdf export is then correct.
- Copy all sheets from problematic drawing > Past in a new drawing generated from default template => depending the situation could solve the problem (not verifiable in this case because model files are not provided).
- As you mentioned, printing in pdf (using a 3rd party pdf printer) generates correct results.
I hope that will help you.
Best regards,
Please, hit the Accept as Solution button if my post answers your question.

Nicolas Bourquin