The whole page is odd. Maybe we should consider a more complex history.
The two uppermost text blocks (red) start parallel to the vellum but slant downwards as they progress left, filling the space to the blue Wolkenband of the upper drawing that is canted in a similar angle. The text looks crammed especially on the left. I would not rule out that the scribe wrote the first letters of the paragraph but then realized he could not keep up the tight spacing.
The lower edge of the uppermost text block is canted by about -6° just like the upper margin of the Wolkenband. The lower Margin of the Wolkenband and the text between the columns is canted by about -9°. The water columns raining down on the nymphs have a cant of more than -10°. The nymphs outstretched arms are back to about -6° as is the lower edge of the green pool. What's your opinion on this? Where did the artist start this drawing? The nymphs? If they ended up in a slightly downward row that might have been further amplified as the drawing progressed upwards. Especially beginners/children often rotate the page while drawing which can result in accidentally canted images. I think the key to solve this riddle is to understand if the upper image was written top-bottom or bottom-top. I can't tell, maybe someone can. The text between the water columns (purple) was certainly added later.
The paragraph below the green pool (orange) looks like it was crammed into the space left to the next paragraph which is the only one that is reasonably straight (yellow). Curiously all text surrounding the 2nd pool (green) does the opposite of the text above. It starts spread out on the left and becomes increasingly compressed and canted upwards toward the right. As if the scribe sought to over-compensate his mistake from the upper text block.
As of why the pool had this corner, similarly no idea. Maybe the source image already had this feature with surrounding text in a similar manner?
I think a layout for this page must have existed but it look like neither artist nor scribe were able to follow it correctly.