There's a couple of possibilities here, and the red status bar will assist in diagnosing.
1: The box is restarting partway through the recording, which creates 2 recordings with a short gap in-between. Recording 1's status bar will fill from the left, recording 2's status bar will fill from the right.
2: The programme is overrunning, but the recording is "complete" according to the published schedule. In this case, the status bar will be full, and the length of the recording will match what you'd expect.
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