Missing learning/ relearning cards

I have just noticed after about four months of use that the learning/ relearning cards are missing. I cant recall looking at the stats and seeing anything different. This screenshot is off my ipad, my mac shows an identical image but for the learn & relearn lines which are not shown.
I have no addons, so what gives?

I should have added that a search filtered on learn shows no cards either.

That is totally normal with the default settings - the count will only be non-zero when you have red cards shown in the counts during review.