Fix

dist/ngx-flowchart/bundles/ngx-flowchart.umd.js

@@ -2486,7 +2486,7 @@
             var prevEdge;
             if (connector.type === FlowchartConstants.leftConnectorType) {
                 var _loop_1 = function (edge) {
-                    if (edge === connector.id) {
+                    if (edge.destination === connector.id) {
                         swapConnector = this_1.modelService.connectors.getConnector(edge.source);
                         dragLabel = edge.label;
                         prevEdge = edge;

dist/ngx-flowchart/fesm2015/ngx-flowchart.js

@@ -1899,7 +1899,7 @@ class FcEdgeDraggingService {
         let prevEdge;
         if (connector.type === FlowchartConstants.leftConnectorType) {
             for (const edge of this.model.edges) {
-                if (edge === connector.id) {
+                if (edge.destination === connector.id) {
                     swapConnector = this.modelService.connectors.getConnector(edge.source);
                     dragLabel = edge.label;
                     prevEdge = edge;

dist/ngx-flowchart/fesm5/ngx-flowchart.js

@@ -2288,7 +2288,7 @@ var FcEdgeDraggingService = /** @class */ (function () {
         var prevEdge;
         if (connector.type === FlowchartConstants.leftConnectorType) {
             var _loop_1 = function (edge) {
-                if (edge === connector.id) {
+                if (edge.destination === connector.id) {
                     swapConnector = this_1.modelService.connectors.getConnector(edge.source);
                     dragLabel = edge.label;
                     prevEdge = edge;

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "scripts": {
     "ng": "ng",
-    "start": "ng serve --open",
+    "start": "ng serve --open --port 4300",
     "build": "ng build ngx-flowchart --prod",
     "test": "ng test ngx-flowchart",
     "lint": "ng lint",

projects/ngx-flowchart/src/lib/edge-dragging.service.ts

@@ -50,7 +50,7 @@ export class FcEdgeDraggingService {
     let prevEdge: FcEdge;
     if (connector.type === FlowchartConstants.leftConnectorType) {
       for (const edge of this.model.edges) {
-        if (edge === connector.id) {
+        if (edge.destination === connector.id) {
           swapConnector = this.modelService.connectors.getConnector(edge.source);
           dragLabel = edge.label;
           prevEdge = edge;