Why am I seeing previously burnt items again?

[araigoshi]

@daga2206

For example, the level 5 Angle came back:

Note that you previously did the level 5 kanji item (https://www.wanikani.com/kanji/角) for 角.

The radical used to be level 21 (yes, after the kanji), until they just moved it:

@mamimumason

Level 21: 角/Angle (radical) - moving down to level 5