Fixed flipeffect bug.

dist/iwmlib.js

@@ -5038,9 +5038,13 @@
         }
 
         start({ targetCenter = null } = {}) {
+            console.log('start');
+            this.flippable.showFront();
             if (this.preloadBack) {
+                console.log('preloadBack');
                 this.flippable.start({ duration: this.flipDuration, targetCenter });
             } else {
+                console.log('no back preload');
                 let back = this.cardWrapper.querySelector('.back');
                 let flippable = this.flippable;
                 this.backLoader.load(back).then(loader => {
@@ -5248,6 +5252,7 @@
 
         start({ targetCenter = null } = {}) {
             this.bringToFront();
+            console.log('flippable start', this.flipped);
             if (!this.flipped) {
                 this.startX = this.element._gsTransform.x;
                 this.startY = this.element._gsTransform.y;