because the most popular version of Core has fewer than 13.5% share of the node count
the most popular version of Knots has a higher share than that
Discussion
Does the total amount not matter? Seems like creative accounting
it certainly matters, for statistics such as "what is the most popular *brand* of bitcoin node software" -- the winner of that category is currently Bitcoin Core, which has ~77% market share compared to Knots' ~22%
but my question is, "what is the most popular version of bitcoin node software?" and for that question, the answer is Bitcoin Knots v29, which has about 13.9% market share, compared to 13.5% for the runner-up, Core v28.1.0
Gotcha