I'm Having Trouble Cooking Shoestring Fries In My Oven, What's Wrong With This?

a couple months back my i spent a week with my friend at his dad's house. we had no food there so we went to the grocery store and bought a couple bags of no name shoestring fries. i had no trouble making them in his oven, we cooked them at 450. so i decided to make some here because they were really good, but they come out rock hard. how can i fix this?
 
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