Exported MP4 video

Hello everyone!

I’m trying to merge two videos using this short tutorial: https://www.uscreen.tv/blog/how-to-combine-videos/

I’m able to do so but the end result is …bad. There are huge glitches here and there and I can’t figure out why this happens. The two seperate videos are fine - but once merged it’s a mess. Do you have any idea or suggestions as to how I can fix this?

Thanks!

For funsies, I just gave it another go and for some reason, the glitches are gone! I didn’t do anything different this time but all of a sudden it works. Go figure.