He’s coming off an ankle injury and apparently still can’t push properly during acceleration.
Dix almost fell on his face at the start. I think his hand placement is too wide for his strength levels. He has also changed his front foot from left to right, and his back foot is now much closer (probably even too close) to the start line than it used to be. His left foot used to be way back and his left leg almost straight in the set position, which I think greatly contributed to his relatively slow starts. He now seems to have gone to the opposite extreme, with his feet close together and much nearer to the line and his hand placement extremely wide.
Agreed on the hand spacing. There seems to be a trend of guys going with too wide of a spacing that does not, apparently, reflect their strength/power levels.