Have video set to a size and see it then get large on the screen in product description making it HU

For example https://www.steveperryfanclub.org/store-2/products/wof/

the video is [KGVID width="420" height="340"]video and path[/KGVID]
but then it jumps to fill the whole bottom. is this mp3 or could it be the theme? now sure how to fix this.