小bug fix

src/features/mark/MarkBoardTrack.vue

@@ -657,6 +657,7 @@ function setUnselect(question: Question, index: number) {
       (q) => !store.removeScoreTracks.includes(q)
     );
     markResult.scoreList[index] = null;
+    store.currentScore = undefined;
   }
   question.hasSetUnselective = !question.hasSetUnselective;
 }