Spelling Mistakes Getting Locked In

"According to the Oxford English Corpus, a database of a billion words, dozens of traditional phrases are now more commonly misspelled than rendered correctly in written English...

"Just desserts" is used 58% of the time instead of the correct spelling, "just deserts" (desert is a variation of deserve), while 59% of all written examples of the phrase in the Corpus call it a "font of knowledge or wisdom" when it should be "fount"."

I thought it had something to do with pudding fountains.