Need Help to Resolve a PicPlayPost/Device Sound Issue

[AC Question]

I own a Nexus 5X (Android version 6.0.1) phone and recently downloaded the PicPlayPost app. After creating and previewing a 3 grid frame, consisting of a 15 second video clip and 2 still pictures, within the app all turned out great. However, upon sharing the same video (by way of an option within the app) to my device and the viewing it on my device, the sound was not the same… It was playing extremely faster and sounded as if chipmunks were speaking. Has anyone else experienced this? Do you know what the problem could be? I need help resolving this issue. Thanks in advance to anyone who can help me resolve this.