What is your operating system?
OS X 10.15.7
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Latest (updated today)
Can you repeat the problem? If so, what are the steps?
Add any video or PNG image to timeline and apply filter “fade video in” (or out) and it defaults to duration. “00:00:01;00” Pres “-” to go shorter and it jumps to “00:00:00;29”.
I guess this last number represents duration in frames? It should be labelled whats going on as this was very confusing at first, or better yet have separate labelled boxes for duration in frames and duration in “human time units” and update both boxes when user adjust either.