It seems to be someone personal notes like he adds some words for making a better understanding and in some places remove some words when he doesn't found them important to be written and another possibility is that he may had naturally forgotten to write them the under text isnt the quran but does include some part of the quran
This video might answer your question https://youtu.be/ceqol1opGT8?t=128. I've copied the link at that specific time, but do listen from the start, for proper context.
Note: Video is in urdu. Just a portion of it is summarized below
Even after the marriage Muhammad S.A.W.W continued doing the same business with Khadijah R.A i.e. taking her goods and ...