fix NESTED_ANSWER_QUESTION getSortNumber

examcloud-core-questions-service/src/main/java/cn/com/qmth/examcloud/core/questions/service/export/ExportPaperAbstractService.java

@@ -1211,7 +1211,7 @@ public abstract class ExportPaperAbstractService {
         for (int i = 0; i < paperDetailExps.size(); i++) {
             PaperDetailExp detailExp = paperDetailExps.get(i);
 
-            if (detailExp.getSortNumber().equals(quesStructType.getId())) {
+            if (quesStructType.getId().equals(detailExp.getSortNumber())) {
                 List<PaperDetailUnitExp> exps = detailExp.getPaperDetailUnits();
                 for (int j = 0; j < exps.size(); j++) {
                     num++;