Butternut squash

Hi
Aother windy day but no rain,had our town show last weekend the secretary asked for volunteers and some veg to sell at the end, jenny and I said yes.It was fun and got through some tricky questions not bad for our second year now to the problem we took two butternut squash to the show that we where quite proud of but today found these two on the plot with a discolouration the rest are fine.Can any one tell me what it is.