when scrubbing video can't jump to end of video

I'm creating a presentation with multiple videos. After watching once, the user can return to the video and is allowed to scrub along the video. I'm having a problem where clicking near the end of the scrub bar brings the video to somewhere in the middle, not near the end. If I continue to click on the end of the timeline, I just keep going back to that middle area.

Why doesn't it work properly?

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