FIX THIS NOW

I love iMovie. HOWEVER, there is an EXTREMELY FRUSTRATING glitch, one that has been in the app for as long as I can remember. If I try to lower the volume of an audio recording that is separate from a video, it will completely ruin the project by glitching out transitions and moving the audio clips. I am currently experiencing this glitch on my iPhone 6s, but I know it is not my phone that is the problem because I have ALSO had this same glitch on my iPhone 5s, iPhone 5, and iPad 3. PLEASE FIX THIS. It is unacceptable and makes the app nearly unusable.

Wurdwrangler about iMovie, v2.2.3