Overexposure in top right corner

For a couple months now, every photo I take with my Canon 6D has had an angled strip of overexposure in the top right hand corner in the exact same spot every time. I don’t know exactly how to google the issue to find possible solutions. I have a couple examples attached below. Could it be somehow that the shutter is getting stuck? Has anyone else experienced this issue or have an idea for a solution?