See https://delinterbot.toolforge.org/demo/10585754_diff.html - it has some table attributes being reordered and https://delinterbot.toolforge.org/demo/10353696_diff.html which has a number of unrelated dirty diffs. Both these pages were edited by a bot to fix up a number of lint errors (font -> span, div with class instead of align, etc.).
My hunch is that what is going on is that the volume of edits on the page are hitting the limits of what the dom diff code can handle in terms of marking small portions of the dom as modified.
So, it might be useful to look into these at some point and tweak the DOM diff algorithm to better detect and mark modified portions of a DOM.