I think that hills radical has moved levels. I’m only level 13, and I definitely remember learning it. But now it’s been shown as level 29 radical.
Also my own bookkeeping tells me that one of my learned items disappeared, and it used to be 14 radicals on level 8 and now we only have 13.
WK has a somewhat annoying habit of moving items around in order to improve the system. That’s just another case. Let’s wait for next post from WK team about Content Update.
On a good side, I definitively did not see hills radical used in any kanji, so moving it to higher level makes sense. I even complained about it recently, so it could be my own fault 