Question / Help FLV File doesn’t work when opened in Shotcut Video Editor

Hoping someone can help me with this.

I record Minecraft videos for my YouTube channel using OBS Studio and have come across this issue in the last couple days. Basically I start recording, and all is well, but when I open the FLV file in my editor, Shotcut, the video file is literally a millisecond long, and nothing with play but the picture of my game when I started the recording! I open it in VLC Video Player and it says the video is 0 seconds long on the control bar, but it does play for the majority of my recording. If anyone knows what’s wrong here, or what I’m doing wrong, please let me know as my viewers get a bit p’d off if I don’t upload every week!