I just came across this weird behavior that seems to have been around for awhile. Check out these search results:
On further testing, it is happening consistently with any words ending in s or ly, as if it's trying to helpfully compensate for plurals or adverbs. Unfortunately in this case, "daily" and "sales" are neither
It's not a major hassle, it's just odd. Does this happen for anyone else, or have we screwed up something here?