Its seems request 1 is swapped with other requests in the waterfall.
Example:
https://www.webpagetest.org/result/161017_5T_8c2d35f5253ef10b170676234c6b5413/1/details/
Its seems request 1 is swapped with other requests in the waterfall.
Example:
https://www.webpagetest.org/result/161017_5T_8c2d35f5253ef10b170676234c6b5413/1/details/