Two replays are selected at once, which should be impossible.
All I've done here is pressed Ctrl+Shift+I. Clearly the replay that didn't show up was actually just behind the other one.
Exiting Inspect or whatever it's called and clicking on the replay again grants a similar view.
Pressing F11 brings me back here.
Clicking on "newest" brings me here. It appears to be blank but the replay is just covering the screen.
You can verify this by pressing Ctrl+Shift+I.
And here's a screenshot of many replays selected at once because why not.