I’m not sure I completely understand what the problem is, but i’ll take a stab.
Back in May of this year, they made a change to WK that would unfreeze items you originally learned but then got moved to a higher level. Is this what you’re talking about OP?
I’m in the same boat, I learned 又 years ago, got it to enlightened, and then disappeared from WK for a while. When I came back last year, 又 was frozen at enlightened and waiting for me to reach level 51 (which I happen to be right now). But on May 16 (I was level 36) they made that change, which released 又 back into the review queue and I burned it.