OK guys so I have my gopro mounted to my fast helmet by the NVG mount. I've been trying out the angle and it's all looking really good

One question I need to ask is, I have it set on Video + photo, set to take a pic every 10 secs whilst simultaniously recording. I've tried this and the vid quality is perfect but the pics are mostly blurred! is this normal? I was thinking it may be using a slower shutter speed as it's "Time lapse"??