Different color A/R

Our lab has been constantly inconsistent one constant is the difference in A/R. They range from green, blue, and some purple. Some look really great some do not. I am to the point were I can never remake a single lens with A/R because the odd are the A/R wont match. I have never worked in a lab before so I was hope someone with experience can help me with why this is happening. One of my suspicions is that they are outsourcing to a different lab because they are having staffing issues but I cannot confirm that. The lab we use uses Crizal or so they tell us.

I am advocating that we change labs but that is all I can do.

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