Luckily, there is no glitch with the stats. 
You level up by getting radicals and, later, kanji to the Guru SRS level. Those stat bars track your progress towards the goal of getting radicals + kanji to Guru. When you start to Guru them, you’ll see it tick up. I believe the very first level doesn’t unlock anything new until all the radicals are at Guru - just a few more and you’ll have new stuff unlocked!
I currently also have nothing of level 15 Guru’d yet, so my stat bars also show zero-zero.
Now the wait times are a bit different in the first few levels, I believe, but this is the overall SRS system that the bulk of WK uses.
As you can see: if you do all reviews the moment you get them, it still takes a few days to level them up to Guru rank.
If you’re doing WK on PC, you can also install this user script. That way you’ll see your radical, etc slowly fill up as you go through Apprentice ranks.
Recently there was this topic and this topic that were talking about basically the same thing. You can also read through the responses there to get an idea of how the system works.
It makes sense, and if you stick with it to level three-four, you’ll never run into these frustrations again. Pretty much everyone here is paying for this product, if it’s just a nonsense scheme that has you waiting around most of the time, there’d be a riot. 
The beginning is slow. Just the beginning.