An answer I flagged today as being of a "very low quality" was deemed to be "helpful":
yet it was not removed. Note that I don't mind it still being there (the question is closed, so it might even get deleted with the question in due time), but I thought that "helpful" flags always caused the answer to be deleted. Am I wrong, or did something go wrong in this case?
I scrolled through ~10 of my "very low quality" flags that were "helpful", and all of them were removed by a mod.