Notes taken on iPad occur blurry on mac

I have taken a handwritten note using my Apple pencil. I sync the notes via iCloud. Some of the notes appear not full-width in Notes on Mac; rather, they are displayed very small and blurry. The blur stays if I export the note to a PDF file. Strangely, this only happens for some notes. On the iPad, all notes look the same. I haven't figured out yet what distinguishes these from those notes. Faulty: Correct: I am using Notes on Mac: 4.6 MacOS: 10.14.6 iOS: 13.1