PDF pages that are linked to are opening up too large or too small.

From Dec 26 -27, 2018, I converted 15 PowerPoints into Adobe Acrobat PDFs with page links and did not encounter any problems. On Dec. 28, I converted two PPTs into Adobe Acrobat PDFs and added page links. When making these two PDFS, I followed the same procedures that I used on Dec. 26 and Dec. 27 when converting PPTs into PDFS with page links. I used the current version of Adobe PDF for all the PDFs referred to above.

The first problematic PDF that I made had two pages(slides) that I linked to opened up small. They opened at 71% instead of 75.8%. Another page(slide) opened too large at 87.2% instead of 75.8%. When I switched to full page view and linked to these three pages(slides) they once more opened up too small or too large.

When using the second problematic PDF, I clicked through all of the slides on full screen view without linking to any of them and they all opened correctly. Then I started clicking through them all over again, but this time I clicked on the first page link. It opened up correctly and I linked to three other pages (slides) and they opened to the correct size. However; once I moved on to next page (slide) without a link it opened up too large and so did every other page(slide) after that. I closed the PDF and then reopened it and clicked through the pages(slides) again without linking to any of them. Once more all the pages opened up at the correct size.

I checked the Known Issues section on the Adobe website and there is no mention of my current problem.