The OCR in Acrobat Pro DC on Mac sometimes generates buggy characters. They become filled-in with black depending on how the file is viewed. The attached file contains 6 isolated examples of these problem OCR characters. They look as expected when first viewed in Acrobat Pro DC, however if you zoom in by 600% or more, they suddenly become filled-in with black. The same problem occurs when printing the file, or viewing it in a web browser even without zooming in. This bug can be especially frustrating because you often don't see the problem until after you print the file.