Hi,
seems to be a bug. Replicate as:
Look how its output: https://youtu.be/5QvvPbg4lt4
- swith to GPU processing
- open gopro clips 1980x1024 50fps
- add 2 short clips and move overal transition
- add next video track
- insert picture png with transparent bacground
- use filter “move-resize”
- render video
output: https://youtu.be/5QvvPbg4lt4