Starting to have a problem

I have had iMovie on my iPhone for a long time about three years to be exact and all the sudden its starting to repeat a problem every time I put in some sound effects or a clip of music or a little Voiceover and finish my movie and click done when I play it none of the sound effects or anything make sound in the final finished movie so please update and fix that problem please other than that happening its been a great app and my top movie editor

Shadow 9D9 about iMovie, v2.2.3