What is your operating system? Windows 10
What is your Shotcut version? v21.08.11 & v21.08.29
I stumbled on that bug using these steps:
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Launch Shotcut 21.08.11 or 21.08.29
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Create a track
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Drag an image or a video to the track
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Select the clip and click the Copy button.
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Open Notepad, paste and save as a .txt file
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Exit Notepad and Shotcut.
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Launch Shotcut again and create a track
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Open the .txt file and copy all the text.
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Select the track in Shotcut and press the Paste button.
The clip is pasted on the track -
Try to drag a different image (or video) on the track.
Instead of that new clip, Shotcut will add a copy of the clip previously pasted on the track.
One workaround found: Copy random text before trying to drag another image or clip.