Why do YouTube TV clips show the wrong length (Chrome browser)?

For example, a clip of a show that says it's 9:18 will cut off at about 1:09. Every time I try to watch a TV clip this seems to happen, the part of the video that plays is way shorter than the screen says. After I play it once, the time changes to the true length (1:09). If a TV episode is listed in 3 parts, 9 minutes seems about the right length for one part of the episode, so I feel like it might be a Chrome problem, not the video itself.