Why are the PDFs for the lectures slides messed up?

[here2infinity]

The boxes/borders are shifted up in the first slide.

In the second slide, the second lambda equation has values written on top of it, like a badly printed newspaper.

This is where I got the lecture slides:

NLP Course 1: Lecture Notes

Lecture notes of the C1 - Natural Language Processing with Classification and Vector Spaces of the Natural Language Specialisation. Note: These slides haven’t been maintained, and that you might find missing topics and incorrect information in them, as opposed to lecture videos, where we try to update the misinformation or errors as soon as we are aware of them. We encourage that you make your own notes. Week 1: C1_W1.pdf (1.5 MB) Week 2: C1_W2.pdf (2.0 MB) Week 3: C1_W3.pdf (1.2 MB) …