Issue with Rush App iPhone: After export an audio click/pop sound created at end of video

I have been using the RUSH app on my iphone (currently iPhone SE) for several years and have had this issue for some time now.  After I exprt videos and view them I see that 2 additional frames have been added at the very end of my videos and it always introduces a click/pop sound on those frames at the end. I have included a video to show the issue. The video should end exactly at 1:00:00 and I am using the disolve effect to fade out both the video and audio.  But when I export it ends at 1:00:02 and adds the click/pop of the audio at the end. My current work around is simply remove the last 15 frames of my video clip with the disolve effect and add a black background photo and have the audio clip muted. This works but it adds time and obviously is a work around and not a fix. I can't surely be the only one experiencing this. Any help would be greatly appreciated.

Note that I have attempted the following to correct the issue but no fix:

unistalled and reinstalled the app

exported video at every quality setting

tried app on another phone