I'm trying to overlay a screen recording of my phone on another video. Both videos are 1920x1080 and 50fps. It renders as expected, with the screen recording taking up a third of the image on the left and the other video playing on the back. My problem is with seeking in the VSE: jumping to a frame, the bottom video jumps to the correct frame, whereas the top video will always start from its first frame.
Why is this?
UPDATE: The video of my phone's screen was taken with AZ Screen Recorder. I'd set it to 50 FPS, but VLC tells me the framerate is something else. I was able to work smoothly with these videos using DaVinci Resolve, where I had to set the phone video's frame rate to 200.
Top video settings: