diff --git a/public/css/survey-backend.css b/public/css/survey-backend.css
index 13fe743..469607b 100644
--- a/public/css/survey-backend.css
+++ b/public/css/survey-backend.css
@@ -28,18 +28,18 @@ body.survey-question-list-page.survey-question-list-clipboard-active .parent_vie
 
 @media (max-width: 1400px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 3;
+        column-count: 6;
     }
 }
 
 @media (max-width: 1100px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 2;
+        column-count: 4;
     }
 }
 
 @media (max-width: 767px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 1;
+        column-count: 2;
     }
 }
\ No newline at end of file
diff --git a/src/Repository/SurveyConditionRepository.php b/src/Repository/SurveyConditionRepository.php
index 4ed4658..a6b0ee7 100644
--- a/src/Repository/SurveyConditionRepository.php
+++ b/src/Repository/SurveyConditionRepository.php
@@ -62,6 +62,7 @@ final class SurveyConditionRepository
     {
         $this->connection->insert('tl_survey_condition', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'sourceQuestion' => (int) ($data['sourceQuestion'] ?? 0),
             'answerValue' => mb_strtolower(trim((string) ($data['answerValue'] ?? ''))),
             'targetQuestion' => (int) ($data['targetQuestion'] ?? 0),
diff --git a/src/Repository/SurveyEditorRepository.php b/src/Repository/SurveyEditorRepository.php
index 807f42c..79a4e61 100644
--- a/src/Repository/SurveyEditorRepository.php
+++ b/src/Repository/SurveyEditorRepository.php
@@ -28,6 +28,7 @@ final class SurveyEditorRepository
 
         $this->connection->insert('tl_survey_editor', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'survey' => $surveyId,
             'member' => $memberId,
         ]);
diff --git a/src/Repository/SurveyQuestionRepository.php b/src/Repository/SurveyQuestionRepository.php
index 32f20eb..3058a99 100644
--- a/src/Repository/SurveyQuestionRepository.php
+++ b/src/Repository/SurveyQuestionRepository.php
@@ -64,6 +64,7 @@ final class SurveyQuestionRepository
 
         $this->connection->insert('tl_survey_content', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'sorting' => $sorting,
             'type' => $type,
             'question' => (string) ($data['question'] ?? ''),
@@ -100,6 +101,7 @@ final class SurveyQuestionRepository
         $isRangeType = 'range' === $type;
 
         $this->connection->update('tl_survey_content', [
+            'tstamp' => time(),
             'type' => $type,
             'question' => (string) ($data['question'] ?? $question->question),
             'description' => (string) ($data['description'] ?? $question->description),