L'Oréal Paris Excellence Hair Color Green Tint Issue

I have been experiencing a green tint issue with my L'Oréal Paris Excellence hair color during my last three applications. Despite using the same brand and color for years, I cannot understand why this is happening. Even the dye I mixed in the container is turning green. My hair looks as if I dyed it green. There is no possibility of receiving a counterfeit product, as I purchased the dyes from a Gratis store.