Of course reported pages should be redigitised
Nothing wrong with many of the originals of the whole page, is likely what they manipulate to produce the pdf or cert. The problem is the image is misaligned squif or horizontally (the top of all the originally loose leaf quarterly copy pages are not level) so the auto-selection box is over the wrong part of the full image. Perhaps worked loose over the years.
Redigitisation would mean getting the original volume from archive, scanning and attaching/relinking new to the 10 people appearing on the page and indexed, involving IT, so more time-consuming.
They still have to manually do all marriages and 1935/1958 onwards births and deaths not imaged by DOVE back in 2008, thence they are not offered as a jpeg or pdf. Done individually to order using office equipment only.
The following is worth a watch, is only a few minutes long. Shows a birth registration 1937 then the process involved in Somerset House to order a BMD from the printed indexes, then the bound quarterly copy ledgers being picked and moved. Parts of the full pages can be seen. Back then we see the clerk overlaying a page with a box cut out to ensure her eye does not stray and transcribe the row above or below as she types.
https://www.britishpathe.com/asset/67429/