Looks like your very dry soil is shedding the water. I would mix in the screened compost with the soil and water slowly over a few days to get it wet. It may take some time. Some people use hair shampoo as an additive to water as a surfactant which may help, don't use too much, maybe a spoonful per 5 gallon bucket. The shampoo ingredient list should include sodium or ammonium laurel sulphate, an anionic surfactant.