Roasted patatoes gone incorrect. : AskCulinary

I just tried to make roasted patatoes today following this recipe:

Kenji roasted patatoes.

I did everything according to the video and all went well until i placed them in a bawl so i can toss them a few times to get those rough edges like kenji was saying in the video, however i got a big fucking mushy mess, all the patatoes got glued to one another and broke their form completely.

Any idea why this happened? i didint even toss them hard or long, like he was doing in the video.The mess was formed as soon as i transfered them to the bawl i started the first toss, they started to glue between themselfs and to the sides of the bawl.