diff --git a/changelog.html b/changelog.html
index e509c7a8b469600bc6819b9ef2a125d11e5eb30a..95b33f635a949395451d05c0bac572460c8a86f3 100644
--- a/changelog.html
+++ b/changelog.html
@@ -57,7 +57,7 @@ Upcoming changes</a>
 <ul class=image>
   <li class='major bug'>
     Regressions in add/delete buttons starting in 1.474.
-    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-14434">issue 14434</a> and <a href="https://issues.jenkins-ci.org/browse/JENKINS-14514">issue 14514</a>)
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-14434">issue 14434</a> and <a href="https://issues.jenkins-ci.org/browse/JENKINS-14495">issue 14495</a>)
   <li class=rfe>
     Collapse nonempty tool installation sections by default in <code>/configure</code>.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-14538">issue 14538</a>)
diff --git a/core/src/main/resources/lib/form/repeatable/repeatable.js b/core/src/main/resources/lib/form/repeatable/repeatable.js
index 10941e69b2cf9feb9348c1230d98d98af19af1d2..047e25078ea186856c11dcca4e4302bdeadf5470 100644
--- a/core/src/main/resources/lib/form/repeatable/repeatable.js
+++ b/core/src/main/resources/lib/form/repeatable/repeatable.js
@@ -18,9 +18,6 @@ var repeatableSupport = {
     // do the initialization
     init : function(container,master,insertionPoint) {
         this.container = $(container);
-        if (this.container.tag != null) {
-            return;
-        }
         this.container.tag = this;
         master = $(master);
         this.blockHTML = master.innerHTML;
diff --git a/war/src/main/webapp/scripts/behavior.js b/war/src/main/webapp/scripts/behavior.js
index f8dcfdc2b68fa8526d25406cc574653d91ce0d08..130b452a19a9e9928434817d0b06d39ee082337c 100644
--- a/war/src/main/webapp/scripts/behavior.js
+++ b/war/src/main/webapp/scripts/behavior.js
@@ -65,12 +65,22 @@ var Behaviour = {
      *      this semantics is preserved.
      */
     applySubtree : function(startNode,includeSelf) {
+        var behaviorsBySelector = {};
         Behaviour.list._each(function(sheet) {
             for (var selector in sheet){
                 function apply(n) {
-                    var list = findElementsBySelector(n,selector,includeSelf);
-                    if (list.length>0)  // just to simplify setting of a breakpoint.
-                        list._each(sheet[selector]);
+                    var behavior = sheet[selector];
+                    var behaviors = behaviorsBySelector[selector];
+                    if (behaviors == null) {
+                        behaviors = [];
+                        behaviorsBySelector[selector] = behaviors;
+                    }
+                    if (behaviors.indexOf(behavior.toString()) == -1) {
+                        behaviors.push(behavior.toString());
+                        var list = findElementsBySelector(n,selector,includeSelf);
+                        if (list.length>0)  // just to simplify setting of a breakpoint.
+                            list._each(sheet[selector]);
+                    }
                 }
 
                 if (startNode instanceof Array) {