Natural order of things:
level 10 radicals => level 10 kanji => level up to 11 => level 10 vocab => level 11 radicals (…)
Notice that this vocab unlocked is not from your current level, but from the previous one. The kanji unlocked it. The point here is that this vocab will reinforce the kanji, so it must follow it before WK throws you with new radicals and kanji.
However, there’s a way around it: the reorder script. With it, you can order items by type (radicals, kanji, vocab) and level.
If you’re not in a hurry to level up (people that level up every 7 days), I’d advise to just follow WK’s order.