Border around the footage after exporting

I recorded a video in 3440x1440 using OBS and as a raw file it was all fine. Then in Shotcut I added an intro (in preview and the proxy itself also shows fine) and changed the export settings to the following:
image
Now the footage has a slight black border around, like it got shrunk by ~15 pixels compared to the “blackboard”. Any ideas why does this happen and how to avoid it next time?

Here’s how it looks after exporting: https://youtu.be/aAhoizwpAlc

This is the problem. You should be setting the Video Mode (beginner task) instead of entering the Advanced mode of Export.

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