diff -u b/paragraphs_collection.install b/paragraphs_collection.install
--- b/paragraphs_collection.install
+++ b/paragraphs_collection.install
@@ -46,19 +46,14 @@
         $paragraph_type->set('behavior_plugins.style.enabled', TRUE);
         $paragraph_type->set('behavior_plugins.style.groups.' . $group_ids[$group] . '.default', $default);
         $paragraph_type->save();
-
-        $paragraphs = \Drupal::entityTypeManager()->getStorage('paragraph')->loadByProperties(['type' => $paragraph_type->get('id')]);
-        foreach ($paragraphs as $id => $paragraph) {
-          $style_name = $paragraph->getBehaviorSetting('style', 'style');
-          $style_discovery = \Drupal::service('paragraphs_collection.style_discovery');
-          $style = $style_discovery->getStyle($style_name);
-          if (!isset($style['groups'])) {
-            continue;
-          }
-          $group_styles = $style_discovery->getStyleOptions($group_ids[$group]);
-          if (in_array($style_name, array_keys($group_styles))) {
-            $paragraph->setBehaviorSettings('style', ['styles' => [reset($style['groups']) => $style_name]]);
-            $paragraph->save();
+      }
+      elseif (!empty($default_style = $paragraph_type->get('behavior_plugins.style.default'))) {
+        if ($style = \Drupal::service('paragraphs_collection.style_discovery')->getStyle($default_style)) {
+          if (in_array(reset($style['groups']), array_values($group_ids))) {
+            $paragraph_type->clear('behavior_plugins.style');
+            $paragraph_type->set('behavior_plugins.style.enabled', TRUE);
+            $paragraph_type->set('behavior_plugins.style.groups.' . reset($style['groups']) . '.default', $default_style);
+            $paragraph_type->save();
           }
         }
       }
diff -u b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
--- b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
+++ b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
@@ -80,6 +80,7 @@
         'id' => $wrapper_id,
       ],
     ];
+    $paragraph_styles = $this->getStyles($paragraph);
     foreach ($this->configuration['groups'] as $group_id => $default) {
       $plugin_default = '';
       if (isset($this->configuration['groups'][$group_id]['default'])) {
@@ -89,7 +90,7 @@
         '#type' => 'select',
         '#title' => $this->t('%group Style', ['%group' => $this->yamlStyleDiscovery->getGroupLabel($group_id)]),
         '#options' => $this->getStyleOptions($group_id, $plugin_default),
-        '#default_value' => $paragraph->getBehaviorSetting($this->getPluginId(), ['styles', $group_id], $this->configuration['groups'][$group_id]['default']),
+        '#default_value' => $paragraph_styles[$group_id],
         '#attributes' => ['class' => ['paragraphs-style']],
       ];
       // Allow empty option in case there is no default style configured.
@@ -213,18 +214,46 @@
     ];
   }
 
+  public function getStyles($paragraph) {
+    $paragraph_styles = [];
+    if ($styles = $paragraph->getBehaviorSetting('style', 'styles')) {
+      foreach ($this->configuration['groups'] as $key => $value) {
+        $paragraph_styles[$key] = $paragraph->getBehaviorSetting($this->getPluginId(), ['styles', $key]);
+      }
+    }
+    elseif ($style_config = $paragraph->getBehaviorSetting('style', 'style')) {
+      if ($style = $this->yamlStyleDiscovery->getStyle($style_config)) {
+        foreach ($this->configuration['groups'] as $key => $value) {
+          if (in_array($key, $style['groups'])) {
+            $paragraph_styles[$key] = $paragraph->getBehaviorSetting($this->getPluginId(), 'style');
+          }
+          else {
+            $paragraph_styles[$key] = '';
+          }
+        }
+      }
+    }
+    else {
+      foreach ($this->configuration['groups'] as $key => $value) {
+        $paragraph_styles[$key] = '';
+      }
+    }
+    return $paragraph_styles;
+  }
+
   /**
    * {@inheritdoc}
    */
   public function view(array &$build, Paragraph $paragraph, EntityViewDisplayInterface $display, $view_mode) {
     // In case the current style is not set, fallback to the default style.
     // If default style is set to none, no style will be applied.
-    $paragraph_styles = [];
+    $paragraph_styles = $this->getStyles($paragraph);
     foreach ($this->configuration['groups'] as $key => $value) {
-      $paragraph_styles[$key] = $paragraph->getBehaviorSetting($this->getPluginId(), ['styles', $key], $this->configuration['groups'][$key]['default']);
-    }
-    foreach ($paragraph_styles as $key => $value) {
-      $style = $this->yamlStyleDiscovery->getStyle($value, $this->configuration['groups'][$key]['default']);
+      $plugin_default = '';
+      if (isset($this->configuration['groups'][$key]['default'])) {
+        $plugin_default = $this->configuration['groups'][$key]['default'];
+      }
+      $style = $this->yamlStyleDiscovery->getStyle($paragraph_styles[$key], $plugin_default);
       if ($style) {
         $build['#attributes']['class'][] = 'paragraphs-behavior-' . $this->getPluginId() . '--' . $style['name'];
         if (!isset($build['#attached']['library'])) {