Why does dye migrate from Polyester into Vinyl?

I am manufacturing a product with Polyester and clear Vinyl. The dye in the polyester has migrated into the vinyl. The product was stored in my base

I am manufacturing a product with Polyester and clear Vinyl. The dye in the polyester has migrated into the vinyl. The product was stored in my basement for 6 months. The temperature was between 65 and 70 degrees Fahrenheit. The Polyester fabric has a Urethane backing that is in direct contact with clear marine grade vinyl. Vinyl has been treated with a plasticizer. Does anyone have any thoughts.?

or:I am manufacturing a product with Polyester and clear Vinyl. The dye in the polyester has migrated into the vinyl. The product was stored in my basement for 6 months. The temperature was between 65 and 70 degrees Fahrenheit. The Polyester fabric has a Urethane backing that is in direct contact with clear marine grade vinyl. Vinyl has been treated with a plasticizer. Does anyone have any thoughts.?

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