Im thinking that the more "wet" ingredients, IE honey and pumpkin you put in, and the more dry ingredients you leave out... is going to have the cave in results.
Your flour is what makes the muffins rise... you get too much wet stuff and not enough flour, you're going to have wet and deflated muffins.
Try going with the original recipe, but adding flour a hlaf cup at a time, until you get those suckers to stay fully inflated lol.
Then again, I could be wrong, BUT I make muffins from scratch and mine always turn out.
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