Fixed flipeffect bug.

lib/flippable.js

@@ -332,9 +332,13 @@ export class DOMFlip {
     }
 
     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 => {
@@ -542,6 +546,7 @@ export class DOMFlippable {
 
     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