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The most common reasons for that are:
You've added css prop flex to your FlatList contentContainerStyle
Move it to a FlatList style prop instead.
Gesture conflicts
Go through the parent tree and see if there's a parent who has pres events like <Pressable onPress={...}>
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make gestureEnabled: false
i was usinggestureEnabled in <stack.Navigator
screenOptions={_ => ({
gestureEnabled: false
})}