Re-submitting this. The card was incorrect. There are multiple sources stating that diverticular bleeding arises most commonly in the right colon.
UpToDate: "Unlike diverticulitis, which occurs primarily in the left colon, the right colon is the source of colonic diverticular bleeding in 50 to 90 percent of patients."
PMID 9118752: "In comparison with LS, RS diverticular disease tended to present more often with massive bleeding than with diverticulitis and fistulation. This bleeding was often more severe and required surgical intervention."
PMID 19873964: "Although diverticula typically occur throughout the colon, diverticular bleeding tends to occur in the thinner-walled ascending (right) colon."
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You can add this yourself by right-clicking on the card -> go to AnkiHub protect fields -> select the field you want to protect -> add it yourself and it won't be overwritten